21511325510 has 16 divisors (see below), whose sum is σ = 38903898672. Its totient is φ = 8563749600.

The previous prime is 21511325497. The next prime is 21511325573. The reversal of 21511325510 is 1552311512.

It is a self number, because there is not a number n which added to its sum of digits gives 21511325510.

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, 5095361 + ... + 5099580.

It is an arithmetic number, because the mean of its divisors is an integer number (2431493667).

Almost surely, 2^21511325510 is an apocalyptic number.

21511325510 is a deficient number, since it is larger than the sum of its proper divisors (17392573162).

21511325510 is a wasteful number, since it uses less digits than its factorization.

21511325510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10195159.

The product of its (nonzero) digits is 1500, while the sum is 26.

The spelling of 21511325510 in words is "twenty-one billion, five hundred eleven million, three hundred twenty-five thousand, five hundred ten".