21203544204 has 48 divisors (see below), whose sum is σ = 55634490240. Its totient is φ = 6982690320.

The previous prime is 21203544161. The next prime is 21203544217. The reversal of 21203544204 is 40244530212.

21203544204 is a `hidden beast` number, since 212 + 0 + 3 + 5 + 442 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1173742 + ... + 1191669.

It is an arithmetic number, because the mean of its divisors is an integer number (1159051880).

Almost surely, 2^21203544204 is an apocalyptic number.

It is an amenable number.

21203544204 is an abundant number, since it is smaller than the sum of its proper divisors (34430946036).

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

21203544204 is a wasteful number, since it uses less digits than its factorization.

21203544204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2365507 (or 2365499 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The spelling of 21203544204 in words is "twenty-one billion, two hundred three million, five hundred forty-four thousand, two hundred four".