21915082 has 16 divisors (see below), whose sum is σ = 37656000. Its totient is φ = 9370368.

The previous prime is 21915077. The next prime is 21915119. The reversal of 21915082 is 28051912.

It is a self number, because there is not a number n which added to its sum of digits gives 21915082.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5418 + ... + 8554.

It is an arithmetic number, because the mean of its divisors is an integer number (2353500).

Almost surely, 2^21915082 is an apocalyptic number.

21915082 is a deficient number, since it is larger than the sum of its proper divisors (15740918).

21915082 is a wasteful number, since it uses less digits than its factorization.

21915082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3645.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 21915082 is about 4681.3547184549. The cubic root of 21915082 is about 279.8429476399.

Adding to 21915082 its reverse (28051912), we get a palindrome (49966994).

The spelling of 21915082 in words is "twenty-one million, nine hundred fifteen thousand, eighty-two".