1321130321221 has 4 divisors (see below), whose sum is σ = 1321415113600. Its totient is φ = 1320845528844.

The previous prime is 1321130321213. The next prime is 1321130321249. The reversal of 1321130321221 is 1221230311231.

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 1321130321221 - 2³ = 1321130321213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321130321192 and 1321130321201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321130321821) 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, 142389231 + ... + 142398508.

It is an arithmetic number, because the mean of its divisors is an integer number (330353778400).

Almost surely, 2^{1321130321221} is an apocalyptic number.

It is an amenable number.

1321130321221 is a deficient number, since it is larger than the sum of its proper divisors (284792379).

1321130321221 is an equidigital number, since it uses as much as digits as its factorization.

1321130321221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284792378.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1321130321221 its reverse (1221230311231), we get a palindrome (2542360632452).

The spelling of 1321130321221 in words is "one trillion, three hundred twenty-one billion, one hundred thirty million, three hundred twenty-one thousand, two hundred twenty-one".