1221431122313 has 4 divisors (see below), whose sum is σ = 1236892275840. Its totient is φ = 1205969968788.

The previous prime is 1221431122283. The next prime is 1221431122321. The reversal of 1221431122313 is 3132211341221.

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 1221431122313 - 2¹² = 1221431118217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1226431122313) 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, 7730576645 + ... + 7730576802.

It is an arithmetic number, because the mean of its divisors is an integer number (309223068960).

Almost surely, 2^{1221431122313} is an apocalyptic number.

It is an amenable number.

1221431122313 is a deficient number, since it is larger than the sum of its proper divisors (15461153527).

1221431122313 is an equidigital number, since it uses as much as digits as its factorization.

1221431122313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15461153526.

The product of its digits is 1728, while the sum is 26.

Adding to 1221431122313 its reverse (3132211341221), we get a palindrome (4353642463534).

The spelling of 1221431122313 in words is "one trillion, two hundred twenty-one billion, four hundred thirty-one million, one hundred twenty-two thousand, three hundred thirteen".