21915674 has 8 divisors (see below), whose sum is σ = 35862048. Its totient is φ = 9961660.

The previous prime is 21915629. The next prime is 21915679. The reversal of 21915674 is 47651912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21915679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498062 + ... + 498105.

It is an arithmetic number, because the mean of its divisors is an integer number (4482756).

Almost surely, 2^21915674 is an apocalyptic number.

21915674 is a deficient number, since it is larger than the sum of its proper divisors (13946374).

21915674 is a wasteful number, since it uses less digits than its factorization.

21915674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996180.

The product of its digits is 15120, while the sum is 35.

The square root of 21915674 is about 4681.4179475881. The cubic root of 21915674 is about 279.8454674500.

The spelling of 21915674 in words is "twenty-one million, nine hundred fifteen thousand, six hundred seventy-four".