21100000204 has 6 divisors (see below), whose sum is σ = 36925000364. Its totient is φ = 10550000100.

The previous prime is 21100000157. The next prime is 21100000219. The reversal of 21100000204 is 40200000112.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2637500022 + ... + 2637500029.

Almost surely, 2^21100000204 is an apocalyptic number.

It is an amenable number.

21100000204 is a deficient number, since it is larger than the sum of its proper divisors (15825000160).

21100000204 is a wasteful number, since it uses less digits than its factorization.

21100000204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5275000055 (or 5275000053 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21100000204 its reverse (40200000112), we get a palindrome (61300000316).

The spelling of 21100000204 in words is "twenty-one billion, one hundred million, two hundred four", and thus it is an aban number.