21085157535 has 64 divisors (see below), whose sum is σ = 37348649856. Its totient is φ = 10091520000.

The previous prime is 21085157497. The next prime is 21085157537. The reversal of 21085157535 is 53575158012.

It is not a de Polignac number, because 21085157535 - 2⁷ = 21085157407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21085157537) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2338035 + ... + 2347035.

It is an arithmetic number, because the mean of its divisors is an integer number (583572654).

Almost surely, 2^21085157535 is an apocalyptic number.

21085157535 is a deficient number, since it is larger than the sum of its proper divisors (16263492321).

21085157535 is a wasteful number, since it uses less digits than its factorization.

21085157535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9356.

The product of its (nonzero) digits is 210000, while the sum is 42.

The spelling of 21085157535 in words is "twenty-one billion, eighty-five million, one hundred fifty-seven thousand, five hundred thirty-five".