21939925294560 has 2304 divisors, whose sum is σ = 92961564917760. Its totient is φ = 4298682286080.

The previous prime is 21939925294549. The next prime is 21939925294589. The reversal of 21939925294560 is 6549252993912.

It is a super-3 number, since 3×21939925294560³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21939925294491 and 21939925294500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 96651653167 + ... + 96651653393.

It is an arithmetic number, because the mean of its divisors is an integer number (40347901440).

Almost surely, 2^{21939925294560} is an apocalyptic number.

21939925294560 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 21939925294560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46480782458880).

21939925294560 is an abundant number, since it is smaller than the sum of its proper divisors (71021639623200).

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

21939925294560 is a wasteful number, since it uses less digits than its factorization.

21939925294560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549 (or 534 counting only the distinct ones).

The product of its (nonzero) digits is 94478400, while the sum is 66.

The spelling of 21939925294560 in words is "twenty-one trillion, nine hundred thirty-nine billion, nine hundred twenty-five million, two hundred ninety-four thousand, five hundred sixty".