21631664167089 has 8 divisors (see below), whose sum is σ = 28842389272320. Its totient is φ = 14421024253296.

The previous prime is 21631664167037. The next prime is 21631664167117. The reversal of 21631664167089 is 98076146613612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21631664167089 - 2⁹ = 21631664166577 is a prime.

It is a super-2 number, since 2×21631664167089² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21631664167489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20703009 + ... + 21722750.

It is an arithmetic number, because the mean of its divisors is an integer number (3605298659040).

Almost surely, 2^{21631664167089} is an apocalyptic number.

It is an amenable number.

21631664167089 is a deficient number, since it is larger than the sum of its proper divisors (7210725105231).

21631664167089 is a wasteful number, since it uses less digits than its factorization.

21631664167089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42595719.

The product of its (nonzero) digits is 15676416, while the sum is 60.

The spelling of 21631664167089 in words is "twenty-one trillion, six hundred thirty-one billion, six hundred sixty-four million, one hundred sixty-seven thousand, eighty-nine".