21662662 has 16 divisors (see below), whose sum is σ = 37269792. Its totient is φ = 9250560.

The previous prime is 21662653. The next prime is 21662671. The reversal of 21662662 is 26626612.

It is an interprime number because it is at equal distance from previous prime (21662653) and next prime (21662671).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1462 + ... + 6742.

It is an arithmetic number, because the mean of its divisors is an integer number (2329362).

Almost surely, 2^21662662 is an apocalyptic number.

21662662 is a deficient number, since it is larger than the sum of its proper divisors (15607130).

21662662 is a wasteful number, since it uses less digits than its factorization.

21662662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5583.

The product of its digits is 10368, while the sum is 31.

The square root of 21662662 is about 4654.3164911725. The cubic root of 21662662 is about 278.7643767177.

The spelling of 21662662 in words is "twenty-one million, six hundred sixty-two thousand, six hundred sixty-two".