21613915190 has 128 divisors (see below), whose sum is σ = 47255097600. Its totient is φ = 7108383744.

The previous prime is 21613915171. The next prime is 21613915223. The reversal of 21613915190 is 9151931612.

It is a super-2 number, since 2×21613915190² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9263264 + ... + 9265596.

It is an arithmetic number, because the mean of its divisors is an integer number (369180450).

Almost surely, 2^21613915190 is an apocalyptic number.

21613915190 is an abundant number, since it is smaller than the sum of its proper divisors (25641182410).

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

21613915190 is a wasteful number, since it uses less digits than its factorization.

21613915190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2471 (or 2457 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 38.

The spelling of 21613915190 in words is "twenty-one billion, six hundred thirteen million, nine hundred fifteen thousand, one hundred ninety".