12220222122121 has 4 divisors (see below), whose sum is σ = 13160239208452. Its totient is φ = 11280205035792.

The previous prime is 12220222122113. The next prime is 12220222122167. The reversal of 12220222122121 is 12122122202221.

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 7362870598521 + 4857351523600 = 2713461^2 + 2203940^2 .

It is a cyclic number.

It is not a de Polignac number, because 12220222122121 - 2³ = 12220222122113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12220222122092 and 12220222122101.

It is not an unprimeable number, because it can be changed into a prime (12220222122181) 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, 470008543146 + ... + 470008543171.

It is an arithmetic number, because the mean of its divisors is an integer number (3290059802113).

Almost surely, 2^{12220222122121} is an apocalyptic number.

It is an amenable number.

12220222122121 is a deficient number, since it is larger than the sum of its proper divisors (940017086331).

12220222122121 is an equidigital number, since it uses as much as digits as its factorization.

12220222122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940017086330.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 12220222122121 its reverse (12122122202221), we get a palindrome (24342344324342).

The spelling of 12220222122121 in words is "twelve trillion, two hundred twenty billion, two hundred twenty-two million, one hundred twenty-two thousand, one hundred twenty-one".