21023444120 has 160 divisors (see below), whose sum is σ = 55419465600. Its totient is φ = 7177250304.

The previous prime is 21023444107. The next prime is 21023444131. The reversal of 21023444120 is 2144432012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 43890041 + ... + 43890519.

It is an arithmetic number, because the mean of its divisors is an integer number (346371660).

Almost surely, 2^21023444120 is an apocalyptic number.

21023444120 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 21023444120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27709732800).

21023444120 is an abundant number, since it is smaller than the sum of its proper divisors (34396021480).

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

21023444120 is an equidigital number, since it uses as much as digits as its factorization.

21023444120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975 (or 950 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21023444120 its reverse (2144432012), we get a palindrome (23167876132).

The spelling of 21023444120 in words is "twenty-one billion, twenty-three million, four hundred forty-four thousand, one hundred twenty".