21023312120 has 16 divisors (see below), whose sum is σ = 47302452360. Its totient is φ = 8409324832.

The previous prime is 21023312119. The next prime is 21023312131. The reversal of 21023312120 is 2121332012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262791362 + ... + 262791441.

Almost surely, 2^21023312120 is an apocalyptic number.

21023312120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21023312120 is an abundant number, since it is smaller than the sum of its proper divisors (26279140240).

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

21023312120 is a wasteful number, since it uses less digits than its factorization.

21023312120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525582814 (or 525582810 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21023312120 its reverse (2121332012), we get a palindrome (23144644132).

The spelling of 21023312120 in words is "twenty-one billion, twenty-three million, three hundred twelve thousand, one hundred twenty".