21097418590 has 32 divisors (see below), whose sum is σ = 39373185024. Its totient is φ = 8130738720.

The previous prime is 21097418567. The next prime is 21097418593. The reversal of 21097418590 is 9581479012.

It is a self number, because there is not a number n which added to its sum of digits gives 21097418590.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21097418593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79534 + ... + 220273.

It is an arithmetic number, because the mean of its divisors is an integer number (1230412032).

Almost surely, 2^21097418590 is an apocalyptic number.

21097418590 is a deficient number, since it is larger than the sum of its proper divisors (18275766434).

21097418590 is a wasteful number, since it uses less digits than its factorization.

21097418590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300072.

The product of its (nonzero) digits is 181440, while the sum is 46.

The spelling of 21097418590 in words is "twenty-one billion, ninety-seven million, four hundred eighteen thousand, five hundred ninety".