21250964 has 12 divisors (see below), whose sum is σ = 42501984. Its totient is φ = 9107544.

The previous prime is 21250961. The next prime is 21250979. The reversal of 21250964 is 46905212.

It is a happy number.

21250964 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21250961) 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, 379454 + ... + 379509.

It is an arithmetic number, because the mean of its divisors is an integer number (3541832).

Almost surely, 2^21250964 is an apocalyptic number.

It is an amenable number.

21250964 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.

21250964 is a wasteful number, since it uses less digits than its factorization.

21250964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758974 (or 758972 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 21250964 is about 4609.8767879413. The cubic root of 21250964 is about 276.9871011905.

The spelling of 21250964 in words is "twenty-one million, two hundred fifty thousand, nine hundred sixty-four".