21686952 has 32 divisors (see below), whose sum is σ = 61963200. Its totient is φ = 6196224.

The previous prime is 21686947. The next prime is 21686957. The reversal of 21686952 is 25968612.

It is an interprime number because it is at equal distance from previous prime (21686947) and next prime (21686957).

It is a self number, because there is not a number n which added to its sum of digits gives 21686952.

It is not an unprimeable number, because it can be changed into a prime (21686957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64377 + ... + 64712.

It is an arithmetic number, because the mean of its divisors is an integer number (1936350).

Almost surely, 2^21686952 is an apocalyptic number.

It is an amenable number.

21686952 is an abundant number, since it is smaller than the sum of its proper divisors (40276248).

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

21686952 is a wasteful number, since it uses less digits than its factorization.

21686952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129105 (or 129101 counting only the distinct ones).

The product of its digits is 51840, while the sum is 39.

The square root of 21686952 is about 4656.9251658149. The cubic root of 21686952 is about 278.8685291602.

The spelling of 21686952 in words is "twenty-one million, six hundred eighty-six thousand, nine hundred fifty-two".