21716952 has 16 divisors (see below), whose sum is σ = 54292440. Its totient is φ = 7238976.

The previous prime is 21716951. The next prime is 21716963. The reversal of 21716952 is 25961712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21716951) 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, 452413 + ... + 452460.

Almost surely, 2^21716952 is an apocalyptic number.

It is an amenable number.

21716952 is an abundant number, since it is smaller than the sum of its proper divisors (32575488).

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

21716952 is a wasteful number, since it uses less digits than its factorization.

21716952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904882 (or 904878 counting only the distinct ones).

The product of its digits is 7560, while the sum is 33.

The square root of 21716952 is about 4660.1450621198. The cubic root of 21716952 is about 278.9970580746.

The spelling of 21716952 in words is "twenty-one million, seven hundred sixteen thousand, nine hundred fifty-two".