21677952 has 32 divisors (see below), whose sum is σ = 57583080. Its totient is φ = 7225856.

The previous prime is 21677947. The next prime is 21677963. The reversal of 21677952 is 25977612.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 21677952.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27843 + ... + 28610.

Almost surely, 2^21677952 is an apocalyptic number.

It is an amenable number.

21677952 is an abundant number, since it is smaller than the sum of its proper divisors (35905128).

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

21677952 is an equidigital number, since it uses as much as digits as its factorization.

21677952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56470 (or 56458 counting only the distinct ones).

The product of its digits is 52920, while the sum is 39.

The square root of 21677952 is about 4655.9587627040. The cubic root of 21677952 is about 278.8299473741.

The spelling of 21677952 in words is "twenty-one million, six hundred seventy-seven thousand, nine hundred fifty-two".