21230315120 has 160 divisors (see below), whose sum is σ = 57371328000. Its totient is φ = 7156251648.

The previous prime is 21230315089. The next prime is 21230315167. The reversal of 21230315120 is 2151303212.

It is a super-2 number, since 2×21230315120² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21230315092 and 21230315101.

It is a congruent number.

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, 8327606 + ... + 8330154.

It is an arithmetic number, because the mean of its divisors is an integer number (358570800).

Almost surely, 2^21230315120 is an apocalyptic number.

21230315120 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 21230315120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28685664000).

21230315120 is an abundant number, since it is smaller than the sum of its proper divisors (36141012880).

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

21230315120 is a wasteful number, since it uses less digits than its factorization.

21230315120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2815 (or 2809 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 21230315120 its reverse (2151303212), we get a palindrome (23381618332).

The spelling of 21230315120 in words is "twenty-one billion, two hundred thirty million, three hundred fifteen thousand, one hundred twenty".