21541513125 has 40 divisors (see below), whose sum is σ = 39153891744. Its totient is φ = 10444360000.

The previous prime is 21541513111. The next prime is 21541513139. The reversal of 21541513125 is 52131514512.

It is an interprime number because it is at equal distance from previous prime (21541513111) and next prime (21541513139).

It is not a de Polignac number, because 21541513125 - 2⁹ = 21541512613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21541513092 and 21541513101.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 501594 + ... + 542843.

Almost surely, 2^21541513125 is an apocalyptic number.

21541513125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21541513125 is a deficient number, since it is larger than the sum of its proper divisors (17612378619).

21541513125 is a wasteful number, since it uses less digits than its factorization.

21541513125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044471 (or 1044456 counting only the distinct ones).

The product of its digits is 6000, while the sum is 30.

The spelling of 21541513125 in words is "twenty-one billion, five hundred forty-one million, five hundred thirteen thousand, one hundred twenty-five".