21102320120 has 32 divisors (see below), whose sum is σ = 54263109600. Its totient is φ = 7235081088.

The previous prime is 21102320111. The next prime is 21102320191. The reversal of 21102320120 is 2102320112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21102320095 and 21102320104.

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, 37682435 + ... + 37682994.

It is an arithmetic number, because the mean of its divisors is an integer number (1695722175).

Almost surely, 2^21102320120 is an apocalyptic number.

21102320120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102320120 is an abundant number, since it is smaller than the sum of its proper divisors (33160789480).

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

21102320120 is a wasteful number, since it uses less digits than its factorization.

21102320120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75365447 (or 75365443 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21102320120 its reverse (2102320112), we get a palindrome (23204640232).

The spelling of 21102320120 in words is "twenty-one billion, one hundred two million, three hundred twenty thousand, one hundred twenty".