21921207068600 has 192 divisors, whose sum is σ = 59053798440000. Its totient is φ = 7412274524160.

The previous prime is 21921207068591. The next prime is 21921207068611. The reversal of 21921207068600 is 686070212912.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48243266 + ... + 48695534.

It is an arithmetic number, because the mean of its divisors is an integer number (307571866875).

Almost surely, 2^{21921207068600} is an apocalyptic number.

21921207068600 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 21921207068600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29526899220000).

21921207068600 is an abundant number, since it is smaller than the sum of its proper divisors (37132591371400).

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

21921207068600 is a wasteful number, since it uses less digits than its factorization.

21921207068600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452770 (or 452761 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 21921207068600 in words is "twenty-one trillion, nine hundred twenty-one billion, two hundred seven million, sixty-eight thousand, six hundred".