21915032 has 8 divisors (see below), whose sum is σ = 41090700. Its totient is φ = 10957512.

The previous prime is 21915031. The next prime is 21915041. The reversal of 21915032 is 23051912.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21915032² = 960537255122048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21914989 and 21915007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21915031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1369682 + ... + 1369697.

Almost surely, 2^21915032 is an apocalyptic number.

It is an amenable number.

21915032 is a deficient number, since it is larger than the sum of its proper divisors (19175668).

21915032 is a wasteful number, since it uses less digits than its factorization.

21915032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2739385 (or 2739381 counting only the distinct ones).

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

The square root of 21915032 is about 4681.3493781174. The cubic root of 21915032 is about 279.8427348160.

Adding to 21915032 its reverse (23051912), we get a palindrome (44966944).

It can be divided in two parts, 219 and 15032, that added together give a palindrome (15251).

The spelling of 21915032 in words is "twenty-one million, nine hundred fifteen thousand, thirty-two".