21980408590 has 64 divisors (see below), whose sum is σ = 47635568640. Its totient is φ = 7133667840.

The previous prime is 21980408581. The next prime is 21980408617. The reversal of 21980408590 is 9580408912.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 21980408590.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1804059 + ... + 1816201.

It is an arithmetic number, because the mean of its divisors is an integer number (744305760).

Almost surely, 2^21980408590 is an apocalyptic number.

21980408590 is an abundant number, since it is smaller than the sum of its proper divisors (25655160050).

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

21980408590 is a wasteful number, since it uses less digits than its factorization.

21980408590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13537.

The product of its (nonzero) digits is 207360, while the sum is 46.

The spelling of 21980408590 in words is "twenty-one billion, nine hundred eighty million, four hundred eight thousand, five hundred ninety".