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21431212 = 2211487073
BaseRepresentation
bin101000111000…
…0001110101100
31111022211002121
41101300032230
520441244322
62043202324
7350106445
oct121601654
944284077
1021431212
1111108650
1272163a4
1345949ba
142bbc2cc
151d34ec7
hex14703ac

21431212 has 12 divisors (see below), whose sum is σ = 40914216. Its totient is φ = 9741440.

The previous prime is 21431209. The next prime is 21431231. The reversal of 21431212 is 21213412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243493 + ... + 243580.

It is an arithmetic number, because the mean of its divisors is an integer number (3409518).

Almost surely, 221431212 is an apocalyptic number.

21431212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21431212 is a deficient number, since it is larger than the sum of its proper divisors (19483004).

21431212 is a wasteful number, since it uses less digits than its factorization.

21431212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487088 (or 487086 counting only the distinct ones).

The product of its digits is 96, while the sum is 16.

The square root of 21431212 is about 4629.3857043889. The cubic root of 21431212 is about 277.7680206825.

Adding to 21431212 its reverse (21213412), we get a palindrome (42644624).

The spelling of 21431212 in words is "twenty-one million, four hundred thirty-one thousand, two hundred twelve".

Divisors: 1 2 4 11 22 44 487073 974146 1948292 5357803 10715606 21431212