220121620520 has 128 divisors (see below), whose sum is σ = 521105840640. Its totient is φ = 83523010560.

The previous prime is 220121620513. The next prime is 220121620553. The reversal of 220121620520 is 25026121022.

It is a Harshad number since it is a multiple of its sum of digits (23).

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, 56980109 + ... + 56983971.

It is an arithmetic number, because the mean of its divisors is an integer number (4071139380).

Almost surely, 2^220121620520 is an apocalyptic number.

220121620520 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 220121620520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260552920320).

220121620520 is an abundant number, since it is smaller than the sum of its proper divisors (300984220120).

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

220121620520 is a wasteful number, since it uses less digits than its factorization.

220121620520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4395 (or 4391 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 220121620520 its reverse (25026121022), we get a palindrome (245147741542).

The spelling of 220121620520 in words is "two hundred twenty billion, one hundred twenty-one million, six hundred twenty thousand, five hundred twenty".