21312113200120 has 64 divisors (see below), whose sum is σ = 48824016580800. Its totient is φ = 8370356628480.

The previous prime is 21312113200099. The next prime is 21312113200121. The reversal of 21312113200120 is 2100231121312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312113200121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6286924 + ... + 9063643.

It is an arithmetic number, because the mean of its divisors is an integer number (762875259075).

Almost surely, 2^{21312113200120} is an apocalyptic number.

21312113200120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21312113200120 is an abundant number, since it is smaller than the sum of its proper divisors (27511903380680).

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

21312113200120 is a wasteful number, since it uses less digits than its factorization.

21312113200120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15351208 (or 15351204 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21312113200120 its reverse (2100231121312), we get a palindrome (23412344321432).

The spelling of 21312113200120 in words is "twenty-one trillion, three hundred twelve billion, one hundred thirteen million, two hundred thousand, one hundred twenty".