21894924204 has 36 divisors (see below), whose sum is σ = 55352442600. Its totient is φ = 7297392960.

The previous prime is 21894924157. The next prime is 21894924209. The reversal of 21894924204 is 40242949812.

21894924204 is a `hidden beast` number, since 2 + 189 + 49 + 2 + 420 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21894924204.

It is not an unprimeable number, because it can be changed into a prime (21894924209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 292159 + ... + 359369.

It is an arithmetic number, because the mean of its divisors is an integer number (1537567850).

Almost surely, 2^21894924204 is an apocalyptic number.

It is an amenable number.

21894924204 is an abundant number, since it is smaller than the sum of its proper divisors (33457518396).

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

21894924204 is a wasteful number, since it uses less digits than its factorization.

21894924204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76270 (or 76265 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 21894924204 in words is "twenty-one billion, eight hundred ninety-four million, nine hundred twenty-four thousand, two hundred four".