21111520325 has 12 divisors (see below), whose sum is σ = 29918040480. Its totient is φ = 14476470960.

The previous prime is 21111520307. The next prime is 21111520349. The reversal of 21111520325 is 52302511112.

It is not a de Polignac number, because 21111520325 - 2¹⁶ = 21111454789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21111520325.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60318455 + ... + 60318804.

It is an arithmetic number, because the mean of its divisors is an integer number (2493170040).

Almost surely, 2^21111520325 is an apocalyptic number.

21111520325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21111520325 is a deficient number, since it is larger than the sum of its proper divisors (8806520155).

21111520325 is a wasteful number, since it uses less digits than its factorization.

21111520325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120637276 (or 120637271 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 23.

The spelling of 21111520325 in words is "twenty-one billion, one hundred eleven million, five hundred twenty thousand, three hundred twenty-five".