2222222021 has 4 divisors (see below), whose sum is σ = 2224133952. Its totient is φ = 2220310092.

The previous prime is 2222222003. The next prime is 2222222033. The reversal of 2222222021 is 1202222222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2222222021 - 2⁶ = 2222221957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2222222071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 954221 + ... + 956546.

It is an arithmetic number, because the mean of its divisors is an integer number (556033488).

Almost surely, 2^2222222021 is an apocalyptic number.

It is an amenable number.

2222222021 is a deficient number, since it is larger than the sum of its proper divisors (1911931).

2222222021 is a wasteful number, since it uses less digits than its factorization.

2222222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911930.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 2222222021 is about 47140.4499448192. The cubic root of 2222222021 is about 1304.9558410017.

Adding to 2222222021 its reverse (1202222222), we get a palindrome (3424444243).

The spelling of 2222222021 in words is "two billion, two hundred twenty-two million, two hundred twenty-two thousand, twenty-one".