1221322122131 has 4 divisors (see below), whose sum is σ = 1221325800000. Its totient is φ = 1221318444264.

The previous prime is 1221322122127. The next prime is 1221322122143. The reversal of 1221322122131 is 1312212231221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221322122131 - 2² = 1221322122127 is a prime.

It is a super-2 number, since 2×1221322122131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221322122097 and 1221322122106.

It is not an unprimeable number, because it can be changed into a prime (1221322122101) 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, 1285256 + ... + 2023493.

It is an arithmetic number, because the mean of its divisors is an integer number (305331450000).

Almost surely, 2^{1221322122131} is an apocalyptic number.

1221322122131 is a deficient number, since it is larger than the sum of its proper divisors (3677869).

1221322122131 is an equidigital number, since it uses as much as digits as its factorization.

1221322122131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3677868.

The product of its digits is 576, while the sum is 23.

Adding to 1221322122131 its reverse (1312212231221), we get a palindrome (2533534353352).

The spelling of 1221322122131 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-two million, one hundred twenty-two thousand, one hundred thirty-one".