21139168167935 has 16 divisors (see below), whose sum is σ = 25957867060224. Its totient is φ = 16517452695072.

The previous prime is 21139168167913. The next prime is 21139168167967. The reversal of 21139168167935 is 53976186193112.

It is a cyclic number.

It is not a de Polignac number, because 21139168167935 - 2²⁰ = 21139167119359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4259534 + ... + 7773156.

It is an arithmetic number, because the mean of its divisors is an integer number (1622366691264).

Almost surely, 2^{21139168167935} is an apocalyptic number.

21139168167935 is a deficient number, since it is larger than the sum of its proper divisors (4818698892289).

21139168167935 is a wasteful number, since it uses less digits than its factorization.

21139168167935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3541654.

The product of its digits is 14696640, while the sum is 62.

The spelling of 21139168167935 in words is "twenty-one trillion, one hundred thirty-nine billion, one hundred sixty-eight million, one hundred sixty-seven thousand, nine hundred thirty-five".