21622664 has 16 divisors (see below), whose sum is σ = 46334400. Its totient is φ = 9266832.

The previous prime is 21622651. The next prime is 21622681. The reversal of 21622664 is 46622612.

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 3 ways as a sum of consecutive naturals, for example, 193004 + ... + 193115.

It is an arithmetic number, because the mean of its divisors is an integer number (2895900).

Almost surely, 2^21622664 is an apocalyptic number.

It is an amenable number.

21622664 is an abundant number, since it is smaller than the sum of its proper divisors (24711736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21622664 is a wasteful number, since it uses less digits than its factorization.

21622664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386132 (or 386128 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 21622664 is about 4650.0176343752. The cubic root of 21622664 is about 278.5927005703.

The spelling of 21622664 in words is "twenty-one million, six hundred twenty-two thousand, six hundred sixty-four".