2222221021 has 4 divisors (see below), whose sum is σ = 2223413152. Its totient is φ = 2221028892.

The previous prime is 2222221009. The next prime is 2222221063. The reversal of 2222221021 is 1201222222.

2222221021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-2222221021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2222220986 and 2222221004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2222221121) 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, 593265 + ... + 596998.

It is an arithmetic number, because the mean of its divisors is an integer number (555853288).

Almost surely, 2^2222221021 is an apocalyptic number.

It is an amenable number.

2222221021 is a deficient number, since it is larger than the sum of its proper divisors (1192131).

2222221021 is a wasteful number, since it uses less digits than its factorization.

2222221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192130.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 2222221021 is about 47140.4393382158. The cubic root of 2222221021 is about 1304.9556452583.

Adding to 2222221021 its reverse (1201222222), we get a palindrome (3423443243).

The spelling of 2222221021 in words is "two billion, two hundred twenty-two million, two hundred twenty-one thousand, twenty-one".