21513952671167 has 16 divisors (see below), whose sum is σ = 23881608432000. Its totient is φ = 19215327481440.

The previous prime is 21513952671163. The next prime is 21513952671181. The reversal of 21513952671167 is 76117625931512.

It is a cyclic number.

It is not a de Polignac number, because 21513952671167 - 2² = 21513952671163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21513952671163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8652908 + ... + 10858209.

It is an arithmetic number, because the mean of its divisors is an integer number (1492600527000).

Almost surely, 2^{21513952671167} is an apocalyptic number.

21513952671167 is a deficient number, since it is larger than the sum of its proper divisors (2367655760833).

21513952671167 is a wasteful number, since it uses less digits than its factorization.

21513952671167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19512886.

The product of its digits is 4762800, while the sum is 56.

The spelling of 21513952671167 in words is "twenty-one trillion, five hundred thirteen billion, nine hundred fifty-two million, six hundred seventy-one thousand, one hundred sixty-seven".