21901532 has 12 divisors (see below), whose sum is σ = 38438736. Its totient is φ = 10919040.

The previous prime is 21901519. The next prime is 21901571. The reversal of 21901532 is 23510912.

It is a junction number, because it is equal to n+sod(n) for n = 21901498 and 21901507.

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, 6344 + ... + 9167.

It is an arithmetic number, because the mean of its divisors is an integer number (3203228).

Almost surely, 2^21901532 is an apocalyptic number.

It is an amenable number.

21901532 is a deficient number, since it is larger than the sum of its proper divisors (16537204).

21901532 is a wasteful number, since it uses less digits than its factorization.

21901532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15868 (or 15866 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 21901532 is about 4679.9072640385. The cubic root of 21901532 is about 279.7852605227.

The spelling of 21901532 in words is "twenty-one million, nine hundred one thousand, five hundred thirty-two".