21662453890 has 32 divisors (see below), whose sum is σ = 48613924224. Its totient is φ = 6751933440.

The previous prime is 21662453867. The next prime is 21662453903. The reversal of 21662453890 is 9835426612.

It is a super-2 number, since 2×21662453890² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21662453890.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14065759 + ... + 14067298.

It is an arithmetic number, because the mean of its divisors is an integer number (1519185132).

Almost surely, 2^21662453890 is an apocalyptic number.

21662453890 is an abundant number, since it is smaller than the sum of its proper divisors (26951470334).

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

21662453890 is a wasteful number, since it uses less digits than its factorization.

21662453890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28133082.

The product of its (nonzero) digits is 622080, while the sum is 46.

The spelling of 21662453890 in words is "twenty-one billion, six hundred sixty-two million, four hundred fifty-three thousand, eight hundred ninety".