21116401134664 has 64 divisors (see below), whose sum is σ = 43786290839040. Its totient is φ = 9466453301760.

The previous prime is 21116401134641. The next prime is 21116401134713. The reversal of 21116401134664 is 46643110461112.

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, 174653097 + ... + 174773959.

It is an arithmetic number, because the mean of its divisors is an integer number (684160794360).

Almost surely, 2^{21116401134664} is an apocalyptic number.

It is an amenable number.

21116401134664 is an abundant number, since it is smaller than the sum of its proper divisors (22669889704376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21116401134664 is a wasteful number, since it uses less digits than its factorization.

21116401134664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148150 (or 148146 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

Adding to 21116401134664 its reverse (46643110461112), we get a palindrome (67759511595776).

The spelling of 21116401134664 in words is "twenty-one trillion, one hundred sixteen billion, four hundred one million, one hundred thirty-four thousand, six hundred sixty-four".