21464436164 has 12 divisors (see below), whose sum is σ = 39772337724. Its totient is φ = 10100911104.

The previous prime is 21464436151. The next prime is 21464436187. The reversal of 21464436164 is 46163446412.

It can be written as a sum of positive squares in 2 ways, for example, as 8884570564 + 12579865600 = 94258^2 + 112160^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157826669 + ... + 157826804.

It is an arithmetic number, because the mean of its divisors is an integer number (3314361477).

Almost surely, 2^21464436164 is an apocalyptic number.

It is an amenable number.

21464436164 is a deficient number, since it is larger than the sum of its proper divisors (18307901560).

21464436164 is a wasteful number, since it uses less digits than its factorization.

21464436164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315653494 (or 315653492 counting only the distinct ones).

The product of its digits is 331776, while the sum is 41.

The spelling of 21464436164 in words is "twenty-one billion, four hundred sixty-four million, four hundred thirty-six thousand, one hundred sixty-four".