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21021169 = 135927407
BaseRepresentation
bin101000000110…
…0000111110001
31110112222121211
41100030013301
520340134134
62030320121
7343451131
oct120140761
943488554
1021021169
1110958574
127059041
134480180
142b12ac1
151ca3764
hex140c1f1

21021169 has 8 divisors (see below), whose sum is σ = 23022720. Its totient is φ = 19074576.

The previous prime is 21021157. The next prime is 21021181. The reversal of 21021169 is 96112012.

It is an interprime number because it is at equal distance from previous prime (21021157) and next prime (21021181).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-21021169 is a prime.

It is a super-2 number, since 2×210211692 = 883779092253122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12937 + ... + 14470.

It is an arithmetic number, because the mean of its divisors is an integer number (2877840).

Almost surely, 221021169 is an apocalyptic number.

It is an amenable number.

21021169 is a deficient number, since it is larger than the sum of its proper divisors (2001551).

21021169 is a wasteful number, since it uses less digits than its factorization.

21021169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27479.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 21021169 is about 4584.8848404295. The cubic root of 21021169 is about 275.9850907370.

The spelling of 21021169 in words is "twenty-one million, twenty-one thousand, one hundred sixty-nine".

Divisors: 1 13 59 767 27407 356291 1617013 21021169