21179352204 has 72 divisors (see below), whose sum is σ = 55631197440. Its totient is φ = 7045586064.

The previous prime is 21179352163. The next prime is 21179352217. The reversal of 21179352204 is 40225397112.

21179352204 is a `hidden beast` number, since 211 + 79 + 352 + 20 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 467257 + ... + 510575.

It is an arithmetic number, because the mean of its divisors is an integer number (772655520).

Almost surely, 2^21179352204 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21179352204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27815598720).

21179352204 is an abundant number, since it is smaller than the sum of its proper divisors (34451845236).

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

21179352204 is a wasteful number, since it uses less digits than its factorization.

21179352204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43841 (or 43827 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 21179352204 in words is "twenty-one billion, one hundred seventy-nine million, three hundred fifty-two thousand, two hundred four".