21423637225320 has 256 divisors, whose sum is σ = 70343754151680. Its totient is φ = 5176582963200.

The previous prime is 21423637225313. The next prime is 21423637225321. The reversal of 21423637225320 is 2352273632412.

It is not an unprimeable number, because it can be changed into a prime (21423637225321) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1191450730 + ... + 1191468710.

It is an arithmetic number, because the mean of its divisors is an integer number (274780289655).

Almost surely, 2^{21423637225320} is an apocalyptic number.

21423637225320 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 21423637225320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35171877075840).

21423637225320 is an abundant number, since it is smaller than the sum of its proper divisors (48920116926360).

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

21423637225320 is a wasteful number, since it uses less digits than its factorization.

21423637225320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20916 (or 20912 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 42.

The spelling of 21423637225320 in words is "twenty-one trillion, four hundred twenty-three billion, six hundred thirty-seven million, two hundred twenty-five thousand, three hundred twenty".