2220122021 has 16 divisors (see below), whose sum is σ = 2533338864. Its totient is φ = 1927425024.

The previous prime is 2220122017. The next prime is 2220122053. The reversal of 2220122021 is 1202210222.

It can be written as a sum of positive squares in 8 ways, for example, as 1240996 + 2218881025 = 1114^2 + 47105^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220122021 - 2² = 2220122017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2220121987 and 2220122005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220122011) 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, 424595 + ... + 429791.

It is an arithmetic number, because the mean of its divisors is an integer number (158333679).

Almost surely, 2^2220122021 is an apocalyptic number.

It is an amenable number.

2220122021 is a deficient number, since it is larger than the sum of its proper divisors (313216843).

2220122021 is a wasteful number, since it uses less digits than its factorization.

2220122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7160.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 2220122021 is about 47118.1708155145. The cubic root of 2220122021 is about 1304.5446503223.

Adding to 2220122021 its reverse (1202210222), we get a palindrome (3422332243).

The spelling of 2220122021 in words is "two billion, two hundred twenty million, one hundred twenty-two thousand, twenty-one".