21023123120 has 160 divisors (see below), whose sum is σ = 52384147200. Its totient is φ = 7831821312.

The previous prime is 21023123089. The next prime is 21023123123. The reversal of 21023123120 is 2132132012.

It is not an unprimeable number, because it can be changed into a prime (21023123123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8278811 + ... + 8281349.

It is an arithmetic number, because the mean of its divisors is an integer number (327400920).

Almost surely, 2^21023123120 is an apocalyptic number.

21023123120 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 21023123120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26192073600).

21023123120 is an abundant number, since it is smaller than the sum of its proper divisors (31361024080).

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

21023123120 is a wasteful number, since it uses less digits than its factorization.

21023123120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2707 (or 2701 counting only the distinct ones).

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

Adding to 21023123120 its reverse (2132132012), we get a palindrome (23155255132).

The spelling of 21023123120 in words is "twenty-one billion, twenty-three million, one hundred twenty-three thousand, one hundred twenty".