1213221302221 has 4 divisors (see below), whose sum is σ = 1233784375200. Its totient is φ = 1192658229244.

The previous prime is 1213221302197. The next prime is 1213221302243. The reversal of 1213221302221 is 1222031223121.

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 1213221302221 - 2⁷ = 1213221302093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213221302192 and 1213221302201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213261302221) 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, 10281536401 + ... + 10281536518.

It is an arithmetic number, because the mean of its divisors is an integer number (308446093800).

Almost surely, 2^{1213221302221} is an apocalyptic number.

It is an amenable number.

1213221302221 is a deficient number, since it is larger than the sum of its proper divisors (20563072979).

1213221302221 is an equidigital number, since it uses as much as digits as its factorization.

1213221302221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20563072978.

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

Adding to 1213221302221 its reverse (1222031223121), we get a palindrome (2435252525342).

The spelling of 1213221302221 in words is "one trillion, two hundred thirteen billion, two hundred twenty-one million, three hundred two thousand, two hundred twenty-one".