22212222202121 has 4 divisors (see below), whose sum is σ = 25385396802432. Its totient is φ = 19039047601812.

The previous prime is 22212222202111. The next prime is 22212222202123. The reversal of 22212222202121 is 12120222221222.

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 not a de Polignac number, because 22212222202121 - 2³⁴ = 22195042332937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22212222202123) 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, 1586587300145 + ... + 1586587300158.

It is an arithmetic number, because the mean of its divisors is an integer number (6346349200608).

Almost surely, 2^{22212222202121} is an apocalyptic number.

It is an amenable number.

22212222202121 is a deficient number, since it is larger than the sum of its proper divisors (3173174600311).

22212222202121 is an equidigital number, since it uses as much as digits as its factorization.

22212222202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3173174600310.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 22212222202121 its reverse (12120222221222), we get a palindrome (34332444423343).

The spelling of 22212222202121 in words is "twenty-two trillion, two hundred twelve billion, two hundred twenty-two million, two hundred two thousand, one hundred twenty-one".