21335171385 has 64 divisors (see below), whose sum is σ = 39766671360. Its totient is φ = 9665376000.

The previous prime is 21335171371. The next prime is 21335171393. The reversal of 21335171385 is 58317153312.

It is not a de Polignac number, because 21335171385 - 2⁴ = 21335171369 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 76420 + ... + 220250.

It is an arithmetic number, because the mean of its divisors is an integer number (621354240).

Almost surely, 2^21335171385 is an apocalyptic number.

It is an amenable number.

21335171385 is a deficient number, since it is larger than the sum of its proper divisors (18431499975).

21335171385 is a wasteful number, since it uses less digits than its factorization.

21335171385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143910.

The product of its digits is 75600, while the sum is 39.

The spelling of 21335171385 in words is "twenty-one billion, three hundred thirty-five million, one hundred seventy-one thousand, three hundred eighty-five".