21194599164 has 24 divisors (see below), whose sum is σ = 49460264448. Its totient is φ = 7063980720.

The previous prime is 21194599133. The next prime is 21194599183. The reversal of 21194599164 is 46199549112.

It is a super-2 number, since 2×21194599164² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7122 + ... + 206009.

It is an arithmetic number, because the mean of its divisors is an integer number (2060844352).

Almost surely, 2^21194599164 is an apocalyptic number.

It is an amenable number.

21194599164 is an abundant number, since it is smaller than the sum of its proper divisors (28265665284).

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

21194599164 is a wasteful number, since it uses less digits than its factorization.

21194599164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221425 (or 221423 counting only the distinct ones).

The product of its digits is 699840, while the sum is 51.

The spelling of 21194599164 in words is "twenty-one billion, one hundred ninety-four million, five hundred ninety-nine thousand, one hundred sixty-four".