21152516266525 has 96 divisors (see below), whose sum is σ = 30885183221760. Its totient is φ = 14067317848320.

The previous prime is 21152516266499. The next prime is 21152516266571. The reversal of 21152516266525 is 52566261525112.

It is not a de Polignac number, because 21152516266525 - 2⁷ = 21152516266397 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2737477212 + ... + 2737484938.

It is an arithmetic number, because the mean of its divisors is an integer number (321720658560).

Almost surely, 2^{21152516266525} is an apocalyptic number.

21152516266525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21152516266525 is a deficient number, since it is larger than the sum of its proper divisors (9732666955235).

21152516266525 is a wasteful number, since it uses less digits than its factorization.

21152516266525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9083 (or 9078 counting only the distinct ones).

The product of its digits is 2160000, while the sum is 49.

The spelling of 21152516266525 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred sixteen million, two hundred sixty-six thousand, five hundred twenty-five".