21323112120 has 96 divisors (see below), whose sum is σ = 70474762800. Its totient is φ = 5589782016.

The previous prime is 21323112077. The next prime is 21323112143. The reversal of 21323112120 is 2121132312.

It is a super-2 number, since 2×21323112120² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21323112093 and 21323112102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 480717 + ... + 523196.

Almost surely, 2^21323112120 is an apocalyptic number.

21323112120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21323112120 is an abundant number, since it is smaller than the sum of its proper divisors (49151650680).

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

21323112120 is a wasteful number, since it uses less digits than its factorization.

21323112120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003989 (or 1003982 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21323112120 its reverse (2121132312), we get a palindrome (23444244432).

The spelling of 21323112120 in words is "twenty-one billion, three hundred twenty-three million, one hundred twelve thousand, one hundred twenty".