21131210223200 has 576 divisors, whose sum is σ = 65868710132736. Its totient is φ = 6429158400000.

The previous prime is 21131210223191. The next prime is 21131210223281. The reversal of 21131210223200 is 232201213112.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 441709682 + ... + 441757518.

It is an arithmetic number, because the mean of its divisors is an integer number (114355399536).

Almost surely, 2^{21131210223200} is an apocalyptic number.

21131210223200 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 21131210223200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32934355066368).

21131210223200 is an abundant number, since it is smaller than the sum of its proper divisors (44737499909536).

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

21131210223200 is a wasteful number, since it uses less digits than its factorization.

21131210223200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48047 (or 48034 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21131210223200 its reverse (232201213112), we get a palindrome (21363411436312).

The spelling of 21131210223200 in words is "twenty-one trillion, one hundred thirty-one billion, two hundred ten million, two hundred twenty-three thousand, two hundred".