22212120121 has 4 divisors (see below), whose sum is σ = 22246451712. Its totient is φ = 22177788532.

The previous prime is 22212120101. The next prime is 22212120143. The reversal of 22212120121 is 12102121222.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12102121222 = 2 ⋅6051060611.

It is a cyclic number.

It is not a de Polignac number, because 22212120121 - 2¹¹ = 22212118073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22212120095 and 22212120104.

It is not an unprimeable number, because it can be changed into a prime (22212120101) 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, 17164825 + ... + 17166118.

It is an arithmetic number, because the mean of its divisors is an integer number (5561612928).

Almost surely, 2^22212120121 is an apocalyptic number.

It is an amenable number.

22212120121 is a deficient number, since it is larger than the sum of its proper divisors (34331591).

22212120121 is an equidigital number, since it uses as much as digits as its factorization.

22212120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34331590.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22212120121 its reverse (12102121222), we get a palindrome (34314241343).

It can be divided in two parts, 222121201 and 21, that added together give a palindrome (222121222).

The spelling of 22212120121 in words is "twenty-two billion, two hundred twelve million, one hundred twenty thousand, one hundred twenty-one".