22002211221 has 4 divisors (see below), whose sum is σ = 29336281632. Its totient is φ = 14668140812.

The previous prime is 22002211163. The next prime is 22002211247. The reversal of 22002211221 is 12211220022.

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 22002211221 - 2³⁴ = 4822342037 is a prime.

It is a super-2 number, since 2×22002211221² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22002211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22002211321) 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, 3667035201 + ... + 3667035206.

It is an arithmetic number, because the mean of its divisors is an integer number (7334070408).

Almost surely, 2^22002211221 is an apocalyptic number.

It is an amenable number.

22002211221 is a deficient number, since it is larger than the sum of its proper divisors (7334070411).

22002211221 is an equidigital number, since it uses as much as digits as its factorization.

22002211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7334070410.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 22002211221 its reverse (12211220022), we get a palindrome (34213431243).

The spelling of 22002211221 in words is "twenty-two billion, two million, two hundred eleven thousand, two hundred twenty-one".