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21012112 = 2411277431
BaseRepresentation
bin101000000100…
…1111010010000
31110112112012101
41100021322100
520334341422
62030210144
7343412542
oct120117220
943475171
1021012112
1110951790
127053954
134479004
142b0d692
151ca0c27
hex1409e90

21012112 has 40 divisors (see below), whose sum is σ = 44675712. Its totient is φ = 9494400.

The previous prime is 21012091. The next prime is 21012127. The reversal of 21012112 is 21121012.

It is a super-3 number, since 3×210121123 (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48537 + ... + 48967.

Almost surely, 221012112 is an apocalyptic number.

21012112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21012112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22337856).

21012112 is an abundant number, since it is smaller than the sum of its proper divisors (23663600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21012112 is a wasteful number, since it uses less digits than its factorization.

21012112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727 (or 721 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 21012112 is about 4583.8970320024. The cubic root of 21012112 is about 275.9454488561.

Adding to 21012112 its reverse (21121012), we get a palindrome (42133124).

Subtracting 21012112 from its reverse (21121012), we obtain a square (108900 = 3302).

The spelling of 21012112 in words is "twenty-one million, twelve thousand, one hundred twelve".

Divisors: 1 2 4 8 11 16 22 44 88 176 277 431 554 862 1108 1724 2216 3047 3448 4432 4741 6094 6896 9482 12188 18964 24376 37928 48752 75856 119387 238774 477548 955096 1313257 1910192 2626514 5253028 10506056 21012112