22012121112221 has 4 divisors (see below), whose sum is σ = 22014358353600. Its totient is φ = 22009883870844.

The previous prime is 22012121112151. The next prime is 22012121112259. The reversal of 22012121112221 is 12221112121022.

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 22012121112221 - 2³⁰ = 22011047370397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22012121112193 and 22012121112202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22012121112281) 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, 1118605931 + ... + 1118625608.

It is an arithmetic number, because the mean of its divisors is an integer number (5503589588400).

Almost surely, 2^{22012121112221} is an apocalyptic number.

It is an amenable number.

22012121112221 is a deficient number, since it is larger than the sum of its proper divisors (2237241379).

22012121112221 is an equidigital number, since it uses as much as digits as its factorization.

22012121112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2237241378.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 22012121112221 its reverse (12221112121022), we get a palindrome (34233233233243).

The spelling of 22012121112221 in words is "twenty-two trillion, twelve billion, one hundred twenty-one million, one hundred twelve thousand, two hundred twenty-one".