2220555521 has 16 divisors (see below), whose sum is σ = 2383563600. Its totient is φ = 2061324288.

The previous prime is 2220555511. The next prime is 2220555529. The reversal of 2220555521 is 1255550222.

It can be written as a sum of positive squares in 8 ways, for example, as 1153553296 + 1067002225 = 33964^2 + 32665^2 .

It is not a de Polignac number, because 2220555521 - 2³⁰ = 1146813697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2220555529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 421721 + ... + 426953.

It is an arithmetic number, because the mean of its divisors is an integer number (148972725).

Almost surely, 2^2220555521 is an apocalyptic number.

It is an amenable number.

2220555521 is a deficient number, since it is larger than the sum of its proper divisors (163008079).

2220555521 is a wasteful number, since it uses less digits than its factorization.

2220555521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5588.

The product of its (nonzero) digits is 10000, while the sum is 29.

The square root of 2220555521 is about 47122.7707271124. The cubic root of 2220555521 is about 1304.6295530584.

The spelling of 2220555521 in words is "two billion, two hundred twenty million, five hundred fifty-five thousand, five hundred twenty-one".