21160661402636 has 48 divisors (see below), whose sum is σ = 42842353800960. Its totient is φ = 8957633995200.

The previous prime is 21160661402623. The next prime is 21160661402689. The reversal of 21160661402636 is 63620416606112.

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, 7744130 + ... + 10113993.

It is an arithmetic number, because the mean of its divisors is an integer number (892549037520).

Almost surely, 2^{21160661402636} is an apocalyptic number.

It is an amenable number.

21160661402636 is an abundant number, since it is smaller than the sum of its proper divisors (21681692398324).

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

21160661402636 is a wasteful number, since it uses less digits than its factorization.

21160661402636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17858654 (or 17858652 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 44.

The spelling of 21160661402636 in words is "twenty-one trillion, one hundred sixty billion, six hundred sixty-one million, four hundred two thousand, six hundred thirty-six".