21201121300020 has 24 divisors (see below), whose sum is σ = 59363139640224. Its totient is φ = 5653632346656.

The previous prime is 21201121300019. The next prime is 21201121300039. The reversal of 21201121300020 is 2000312110212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176676010774 + ... + 176676010893.

It is an arithmetic number, because the mean of its divisors is an integer number (2473464151676).

Almost surely, 2^{21201121300020} is an apocalyptic number.

21201121300020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201121300020 is an abundant number, since it is smaller than the sum of its proper divisors (38162018340204).

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

21201121300020 is a wasteful number, since it uses less digits than its factorization.

21201121300020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353352021679 (or 353352021677 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21201121300020 its reverse (2000312110212), we get a palindrome (23201433410232).

The spelling of 21201121300020 in words is "twenty-one trillion, two hundred one billion, one hundred twenty-one million, three hundred thousand, twenty".