21470956 has 12 divisors (see below), whose sum is σ = 40464592. Its totient is φ = 9909648.

The previous prime is 21470947. The next prime is 21470957. The reversal of 21470956 is 65907412.

It is a super-2 number, since 2×21470956² = 922003903107872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21470957) 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, 206400 + ... + 206503.

Almost surely, 2^21470956 is an apocalyptic number.

21470956 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21470956 is a deficient number, since it is larger than the sum of its proper divisors (18993636).

21470956 is a wasteful number, since it uses less digits than its factorization.

21470956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412920 (or 412918 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 21470956 is about 4633.6762942614. The cubic root of 21470956 is about 277.9396207915.

The spelling of 21470956 in words is "twenty-one million, four hundred seventy thousand, nine hundred fifty-six".