21301238745820 has 36 divisors (see below), whose sum is σ = 49168892416392. Its totient is φ = 7745904997600.

The previous prime is 21301238745751. The next prime is 21301238745833. The reversal of 21301238745820 is 2854783210312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4401079966 + ... + 4401084805.

It is an arithmetic number, because the mean of its divisors is an integer number (1365802567122).

Almost surely, 2^{21301238745820} is an apocalyptic number.

21301238745820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21301238745820 is an abundant number, since it is smaller than the sum of its proper divisors (27867653670572).

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

21301238745820 is a wasteful number, since it uses less digits than its factorization.

21301238745820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8802164802 (or 8802164789 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 21301238745820 in words is "twenty-one trillion, three hundred one billion, two hundred thirty-eight million, seven hundred forty-five thousand, eight hundred twenty".