22212220012121 has 4 divisors (see below), whose sum is σ = 22254853832244. Its totient is φ = 22169586192000.

The previous prime is 22212220012019. The next prime is 22212220012123. The reversal of 22212220012121 is 12121002221222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7198059726400 + 15014160285721 = 2682920^2 + 3874811^2 .

It is a cyclic number.

It is not a de Polignac number, because 22212220012121 - 2¹⁸ = 22212219749977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22212220012093 and 22212220012102.

It is not an unprimeable number, because it can be changed into a prime (22212220012123) 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, 21316909280 + ... + 21316910321.

It is an arithmetic number, because the mean of its divisors is an integer number (5563713458061).

Almost surely, 2^{22212220012121} is an apocalyptic number.

It is an amenable number.

22212220012121 is a deficient number, since it is larger than the sum of its proper divisors (42633820123).

22212220012121 is an equidigital number, since it uses as much as digits as its factorization.

22212220012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42633820122.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 22212220012121 its reverse (12121002221222), we get a palindrome (34333222233343).

The spelling of 22212220012121 in words is "twenty-two trillion, two hundred twelve billion, two hundred twenty million, twelve thousand, one hundred twenty-one".