21011890359 has 32 divisors (see below), whose sum is σ = 29757809664. Its totient is φ = 13171294080.

The previous prime is 21011890337. The next prime is 21011890379. The reversal of 21011890359 is 95309811012.

It is not a de Polignac number, because 21011890359 - 2²⁹ = 20475019447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011890309) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 341437 + ... + 398249.

It is an arithmetic number, because the mean of its divisors is an integer number (929931552).

Almost surely, 2^21011890359 is an apocalyptic number.

21011890359 is a deficient number, since it is larger than the sum of its proper divisors (8745919305).

21011890359 is a wasteful number, since it uses less digits than its factorization.

21011890359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56967.

The product of its (nonzero) digits is 19440, while the sum is 39.

The spelling of 21011890359 in words is "twenty-one billion, eleven million, eight hundred ninety thousand, three hundred fifty-nine".