1331020322221 has 4 divisors (see below), whose sum is σ = 1331971732000. Its totient is φ = 1330068912444.

The previous prime is 1331020322117. The next prime is 1331020322243. The reversal of 1331020322221 is 1222230201331.

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 a de Polignac number, because none of the positive numbers 2^k-1331020322221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331020322192 and 1331020322201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331021322221) 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, 475702791 + ... + 475705588.

It is an arithmetic number, because the mean of its divisors is an integer number (332992933000).

Almost surely, 2^{1331020322221} is an apocalyptic number.

It is an amenable number.

1331020322221 is a deficient number, since it is larger than the sum of its proper divisors (951409779).

1331020322221 is an equidigital number, since it uses as much as digits as its factorization.

1331020322221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951409778.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 1331020322221 its reverse (1222230201331), we get a palindrome (2553250523552).

The spelling of 1331020322221 in words is "one trillion, three hundred thirty-one billion, twenty million, three hundred twenty-two thousand, two hundred twenty-one".