21269956 has 12 divisors (see below), whose sum is σ = 37295020. Its totient is φ = 10614240.

The previous prime is 21269953. The next prime is 21269957. The reversal of 21269956 is 65996212.

It can be written as a sum of positive squares in 2 ways, for example, as 14561856 + 6708100 = 3816^2 + 2590^2 .

It is a super-2 number, since 2×21269956² = 904822056483872, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21269953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2751 + ... + 7078.

Almost surely, 2^21269956 is an apocalyptic number.

It is an amenable number.

21269956 is a deficient number, since it is larger than the sum of its proper divisors (16025064).

21269956 is a wasteful number, since it uses less digits than its factorization.

21269956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10374 (or 10372 counting only the distinct ones).

The product of its digits is 58320, while the sum is 40.

The square root of 21269956 is about 4611.9362528118. The cubic root of 21269956 is about 277.0695911376.

The spelling of 21269956 in words is "twenty-one million, two hundred sixty-nine thousand, nine hundred fifty-six".