21256676 has 12 divisors (see below), whose sum is σ = 42513408. Its totient is φ = 9109992.

The previous prime is 21256673. The next prime is 21256679. The reversal of 21256676 is 67665212.

It is an interprime number because it is at equal distance from previous prime (21256673) and next prime (21256679).

21256676 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21256673) by changing a digit.

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, 379556 + ... + 379611.

It is an arithmetic number, because the mean of its divisors is an integer number (3542784).

Almost surely, 2^21256676 is an apocalyptic number.

It is an amenable number.

21256676 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21256676 is a wasteful number, since it uses less digits than its factorization.

21256676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759178 (or 759176 counting only the distinct ones).

The product of its digits is 30240, while the sum is 35.

The square root of 21256676 is about 4610.4962856508. The cubic root of 21256676 is about 277.0119158858.

The spelling of 21256676 in words is "twenty-one million, two hundred fifty-six thousand, six hundred seventy-six".