21231202200 has 384 divisors, whose sum is σ = 73193440320. Its totient is φ = 5057740800.

The previous prime is 21231202177. The next prime is 21231202217. The reversal of 21231202200 is 220213212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21231202200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 63000432 + ... + 63000768.

Almost surely, 2^21231202200 is an apocalyptic number.

21231202200 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 21231202200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36596720160).

21231202200 is an abundant number, since it is smaller than the sum of its proper divisors (51962238120).

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

21231202200 is a wasteful number, since it uses less digits than its factorization.

21231202200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607 (or 598 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21231202200 its reverse (220213212), we get a palindrome (21451415412).

The spelling of 21231202200 in words is "twenty-one billion, two hundred thirty-one million, two hundred two thousand, two hundred".