21022223120 has 80 divisors (see below), whose sum is σ = 51899557680. Its totient is φ = 7891648512.

The previous prime is 21022223111. The next prime is 21022223249. The reversal of 21022223120 is 2132222012.

It can be written as a sum of positive squares in 8 ways, for example, as 1003368976 + 20018854144 = 31676^2 + 141488^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (17).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 458186 + ... + 501974.

It is an arithmetic number, because the mean of its divisors is an integer number (648744471).

Almost surely, 2^21022223120 is an apocalyptic number.

21022223120 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 21022223120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25949778840).

21022223120 is an abundant number, since it is smaller than the sum of its proper divisors (30877334560).

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

21022223120 is a wasteful number, since it uses less digits than its factorization.

21022223120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44172 (or 44166 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21022223120 its reverse (2132222012), we get a palindrome (23154445132).

It can be divided in two parts, 2102 and 2223120, that added together give a palindrome (2225222).

The spelling of 21022223120 in words is "twenty-one billion, twenty-two million, two hundred twenty-three thousand, one hundred twenty".