21589210990 has 16 divisors (see below), whose sum is σ = 38881185840. Its totient is φ = 8631105280.

The previous prime is 21589210987. The next prime is 21589211003. The reversal of 21589210990 is 9901298512.

It is a self number, because there is not a number n which added to its sum of digits gives 21589210990.

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, 552556 + ... + 590335.

It is an arithmetic number, because the mean of its divisors is an integer number (2430074115).

Almost surely, 2^21589210990 is an apocalyptic number.

21589210990 is a deficient number, since it is larger than the sum of its proper divisors (17291974850).

21589210990 is a wasteful number, since it uses less digits than its factorization.

21589210990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144787.

The product of its (nonzero) digits is 116640, while the sum is 46.

The spelling of 21589210990 in words is "twenty-one billion, five hundred eighty-nine million, two hundred ten thousand, nine hundred ninety".