21204525205200 has 60 divisors (see below), whose sum is σ = 67925162411168. Its totient is φ = 5654540054400.

The previous prime is 21204525205183. The next prime is 21204525205273. The reversal of 21204525205200 is 250252540212.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8835217636 + ... + 8835220035.

Almost surely, 2^{21204525205200} is an apocalyptic number.

21204525205200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21204525205200 is an abundant number, since it is smaller than the sum of its proper divisors (46720637205968).

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

21204525205200 is a wasteful number, since it uses less digits than its factorization.

21204525205200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17670437692 (or 17670437681 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 30.

Adding to 21204525205200 its reverse (250252540212), we get a palindrome (21454777745412).

The spelling of 21204525205200 in words is "twenty-one trillion, two hundred four billion, five hundred twenty-five million, two hundred five thousand, two hundred".