21120202231320 has 64 divisors (see below), whose sum is σ = 63361828696320. Its totient is φ = 5631945305984.

The previous prime is 21120202231309. The next prime is 21120202231321. The reversal of 21120202231320 is 2313220202112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120202231321) 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, 4649149 + ... + 7990931.

It is an arithmetic number, because the mean of its divisors is an integer number (990028573380).

Almost surely, 2^{21120202231320} is an apocalyptic number.

21120202231320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120202231320 is an abundant number, since it is smaller than the sum of its proper divisors (42241626465000).

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

21120202231320 is a wasteful number, since it uses less digits than its factorization.

21120202231320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3394464 (or 3394460 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21120202231320 its reverse (2313220202112), we get a palindrome (23433422433432).

The spelling of 21120202231320 in words is "twenty-one trillion, one hundred twenty billion, two hundred two million, two hundred thirty-one thousand, three hundred twenty".