21161016464 has 40 divisors (see below), whose sum is σ = 47650729920. Its totient is φ = 8915292288.

The previous prime is 21161016403. The next prime is 21161016491. The reversal of 21161016464 is 46461016112.

It is a self number, because there is not a number n which added to its sum of digits gives 21161016464.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1594559 + ... + 1607774.

It is an arithmetic number, because the mean of its divisors is an integer number (1191268248).

Almost surely, 2^21161016464 is an apocalyptic number.

It is an amenable number.

21161016464 is an abundant number, since it is smaller than the sum of its proper divisors (26489713456).

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

21161016464 is a wasteful number, since it uses less digits than its factorization.

21161016464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3202407 (or 3202401 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The spelling of 21161016464 in words is "twenty-one billion, one hundred sixty-one million, sixteen thousand, four hundred sixty-four".