12220211220121 has 4 divisors (see below), whose sum is σ = 12220246092852. Its totient is φ = 12220176347392.

The previous prime is 12220211220083. The next prime is 12220211220127. The reversal of 12220211220121 is 12102211202221.

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 2005795220121 + 10214416000000 = 1416261^2 + 3196000^2 .

It is a cyclic number.

It is not a de Polignac number, because 12220211220121 - 2³³ = 12211621285529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12220211220127) 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, 16905340 + ... + 17613373.

It is an arithmetic number, because the mean of its divisors is an integer number (3055061523213).

Almost surely, 2^{12220211220121} is an apocalyptic number.

It is an amenable number.

12220211220121 is a deficient number, since it is larger than the sum of its proper divisors (34872731).

12220211220121 is an equidigital number, since it uses as much as digits as its factorization.

12220211220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34872730.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12220211220121 its reverse (12102211202221), we get a palindrome (24322422422342).

The spelling of 12220211220121 in words is "twelve trillion, two hundred twenty billion, two hundred eleven million, two hundred twenty thousand, one hundred twenty-one".