12220121221213 has 4 divisors (see below), whose sum is σ = 12220367094208. Its totient is φ = 12219875348220.

The previous prime is 12220121221159. The next prime is 12220121221283. The reversal of 12220121221213 is 31212212102221.

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 12220121221213 - 2³³ = 12211531286621 is a prime.

It is a super-2 number, since 2×12220121221213² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12220121221283) 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, 122861931 + ... + 122961352.

It is an arithmetic number, because the mean of its divisors is an integer number (3055091773552).

Almost surely, 2^{12220121221213} is an apocalyptic number.

It is an amenable number.

12220121221213 is a deficient number, since it is larger than the sum of its proper divisors (245872995).

12220121221213 is an equidigital number, since it uses as much as digits as its factorization.

12220121221213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245872994.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 12220121221213 its reverse (31212212102221), we get a palindrome (43432333323434).

The spelling of 12220121221213 in words is "twelve trillion, two hundred twenty billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred thirteen".