21915262 has 4 divisors (see below), whose sum is σ = 32872896. Its totient is φ = 10957630.

The previous prime is 21915259. The next prime is 21915263. The reversal of 21915262 is 26251912.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21915262.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21915263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5478814 + ... + 5478817.

It is an arithmetic number, because the mean of its divisors is an integer number (8218224).

Almost surely, 2^21915262 is an apocalyptic number.

21915262 is a deficient number, since it is larger than the sum of its proper divisors (10957634).

21915262 is a wasteful number, since it uses less digits than its factorization.

21915262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10957633.

The product of its digits is 2160, while the sum is 28.

The square root of 21915262 is about 4681.3739436195. The cubic root of 21915262 is about 279.8437138032.

The spelling of 21915262 in words is "twenty-one million, nine hundred fifteen thousand, two hundred sixty-two".