21725730752535 has 24 divisors (see below), whose sum is σ = 37679125302000. Its totient is φ = 11580535786752.

The previous prime is 21725730752519. The next prime is 21725730752549. The reversal of 21725730752535 is 53525703752712.

21725730752535 is a `hidden beast` number, since 2 + 1 + 7 + 2 + 5 + 7 + 30 + 75 + 2 + 535 = 666.

It is not a de Polignac number, because 21725730752535 - 2⁴ = 21725730752519 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 135765285 + ... + 135925214.

It is an arithmetic number, because the mean of its divisors is an integer number (1569963554250).

Almost surely, 2^{21725730752535} is an apocalyptic number.

21725730752535 is a deficient number, since it is larger than the sum of its proper divisors (15953394549465).

21725730752535 is a wasteful number, since it uses less digits than its factorization.

21725730752535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271692287 (or 271692284 counting only the distinct ones).

The product of its (nonzero) digits is 15435000, while the sum is 54.

The spelling of 21725730752535 in words is "twenty-one trillion, seven hundred twenty-five billion, seven hundred thirty million, seven hundred fifty-two thousand, five hundred thirty-five".