21204131200 has 192 divisors, whose sum is σ = 59988705120. Its totient is φ = 7254835200.

The previous prime is 21204131197. The next prime is 21204131213. The reversal of 21204131200 is 213140212.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

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, 18389824 + ... + 18390976.

Almost surely, 2^21204131200 is an apocalyptic number.

21204131200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21204131200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29994352560).

21204131200 is an abundant number, since it is smaller than the sum of its proper divisors (38784573920).

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

21204131200 is a wasteful number, since it uses less digits than its factorization.

21204131200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2005 (or 1988 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21204131200 its reverse (213140212), we get a palindrome (21417271412).

The spelling of 21204131200 in words is "twenty-one billion, two hundred four million, one hundred thirty-one thousand, two hundred".