21230164404 has 72 divisors (see below), whose sum is σ = 54001027080. Its totient is φ = 7032517632.

The previous prime is 21230164391. The next prime is 21230164427. The reversal of 21230164404 is 40446103212.

It is a happy number.

21230164404 is a `hidden beast` number, since 2 + 12 + 3 + 0 + 1 + 644 + 0 + 4 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 17042780304 + 4187384100 = 130548^2 + 64710^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10161792 + ... + 10163880.

It is an arithmetic number, because the mean of its divisors is an integer number (750014265).

Almost surely, 2^21230164404 is an apocalyptic number.

It is an amenable number.

21230164404 is an abundant number, since it is smaller than the sum of its proper divisors (32770862676).

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

21230164404 is a wasteful number, since it uses less digits than its factorization.

21230164404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3729 (or 3724 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 21230164404 its reverse (40446103212), we get a palindrome (61676267616).

The spelling of 21230164404 in words is "twenty-one billion, two hundred thirty million, one hundred sixty-four thousand, four hundred four".