12220122021221 has 4 divisors (see below), whose sum is σ = 12220198842432. Its totient is φ = 12220045200012.

The previous prime is 12220122021203. The next prime is 12220122021251. The reversal of 12220122021221 is 12212022102221.

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 a de Polignac number, because none of the positive numbers 2^k-12220122021221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12220122021193 and 12220122021202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12220122021251) 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, 38171501 + ... + 38490306.

It is an arithmetic number, because the mean of its divisors is an integer number (3055049710608).

Almost surely, 2^{12220122021221} is an apocalyptic number.

It is an amenable number.

12220122021221 is a deficient number, since it is larger than the sum of its proper divisors (76821211).

12220122021221 is an equidigital number, since it uses as much as digits as its factorization.

12220122021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76821210.

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

Adding to 12220122021221 its reverse (12212022102221), we get a palindrome (24432144123442).

The spelling of 12220122021221 in words is "twelve trillion, two hundred twenty billion, one hundred twenty-two million, twenty-one thousand, two hundred twenty-one".