21132100404 has 18 divisors (see below), whose sum is σ = 53417253890. Its totient is φ = 7044033456.

The previous prime is 21132100397. The next prime is 21132100421. The reversal of 21132100404 is 40400123112.

It can be written as a sum of positive squares in only one way, i.e., 14424490404 + 6707610000 = 120102^2 + 81900^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 293501359 + ... + 293501430.

Almost surely, 2^21132100404 is an apocalyptic number.

It is an amenable number.

21132100404 is an abundant number, since it is smaller than the sum of its proper divisors (32285153486).

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

21132100404 is a wasteful number, since it uses less digits than its factorization.

21132100404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587002799 (or 587002794 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21132100404 its reverse (40400123112), we get a palindrome (61532223516).

The spelling of 21132100404 in words is "twenty-one billion, one hundred thirty-two million, one hundred thousand, four hundred four".