21162969 has 6 divisors (see below), whose sum is σ = 30568746. Its totient is φ = 14108640.

The previous prime is 21162959. The next prime is 21162989. The reversal of 21162969 is 96926112.

21162969 is a `hidden beast` number, since 21 + 1 + 629 + 6 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13395600 + 7767369 = 3660^2 + 2787^2 .

It is not a de Polignac number, because 21162969 - 2⁵ = 21162937 is a prime.

It is a super-2 number, since 2×21162969² = 895742513789922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21162949) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1175712 + ... + 1175729.

It is an arithmetic number, because the mean of its divisors is an integer number (5094791).

Almost surely, 2^21162969 is an apocalyptic number.

It is an amenable number.

21162969 is a deficient number, since it is larger than the sum of its proper divisors (9405777).

21162969 is a wasteful number, since it uses less digits than its factorization.

21162969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2351447 (or 2351444 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 21162969 is about 4600.3227060718. The cubic root of 21162969 is about 276.6042605329.

The spelling of 21162969 in words is "twenty-one million, one hundred sixty-two thousand, nine hundred sixty-nine".