21023210120 has 128 divisors (see below), whose sum is σ = 53793590400. Its totient is φ = 7324262400.

The previous prime is 21023210113. The next prime is 21023210141. The reversal of 21023210120 is 2101232012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21023210095 and 21023210104.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1665272 + ... + 1677848.

It is an arithmetic number, because the mean of its divisors is an integer number (420262425).

Almost surely, 2^21023210120 is an apocalyptic number.

21023210120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21023210120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26896795200).

21023210120 is an abundant number, since it is smaller than the sum of its proper divisors (32770380280).

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

21023210120 is a wasteful number, since it uses less digits than its factorization.

21023210120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12759 (or 12755 counting only the distinct ones).

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

Adding to 21023210120 its reverse (2101232012), we get a palindrome (23124442132).

The spelling of 21023210120 in words is "twenty-one billion, twenty-three million, two hundred ten thousand, one hundred twenty".