1213220223121 has 4 divisors (see below), whose sum is σ = 1216115737200. Its totient is φ = 1210324709044.

The previous prime is 1213220223101. The next prime is 1213220223133.

1213220223121 is nontrivially palindromic in base 10.

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 1213220223121 - 2³¹ = 1211072739473 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213220223092 and 1213220223101.

It is not an unprimeable number, because it can be changed into a prime (1213220223101) 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, 1447756411 + ... + 1447757248.

It is an arithmetic number, because the mean of its divisors is an integer number (304028934300).

Almost surely, 2^{1213220223121} is an apocalyptic number.

It is an amenable number.

1213220223121 is a deficient number, since it is larger than the sum of its proper divisors (2895514079).

1213220223121 is an equidigital number, since it uses as much as digits as its factorization.

1213220223121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2895514078.

The product of its (nonzero) digits is 576, while the sum is 22.

It can be divided in two parts, 1213220 and 223121, that added together give a palindrome (1436341).

The spelling of 1213220223121 in words is "one trillion, two hundred thirteen billion, two hundred twenty million, two hundred twenty-three thousand, one hundred twenty-one".