21660622 has 8 divisors (see below), whose sum is σ = 33611400. Its totient is φ = 10456824.

The previous prime is 21660619. The next prime is 21660637. The reversal of 21660622 is 22606612.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186672 + ... + 186787.

It is an arithmetic number, because the mean of its divisors is an integer number (4201425).

Almost surely, 2^21660622 is an apocalyptic number.

21660622 is a deficient number, since it is larger than the sum of its proper divisors (11950778).

21660622 is a wasteful number, since it uses less digits than its factorization.

21660622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373490.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 21660622 is about 4654.0973346074. The cubic root of 21660622 is about 278.7556259128.

The spelling of 21660622 in words is "twenty-one million, six hundred sixty thousand, six hundred twenty-two".