1331551255321 has 4 divisors (see below), whose sum is σ = 1521772863232. Its totient is φ = 1141329647412.

The previous prime is 1331551255319. The next prime is 1331551255351. The reversal of 1331551255321 is 1235521551331.

It is a happy number.

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 1331551255321 - 2¹ = 1331551255319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331551255301) 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, 95110803945 + ... + 95110803958.

It is an arithmetic number, because the mean of its divisors is an integer number (380443215808).

Almost surely, 2^{1331551255321} is an apocalyptic number.

It is an amenable number.

1331551255321 is a deficient number, since it is larger than the sum of its proper divisors (190221607911).

1331551255321 is an equidigital number, since it uses as much as digits as its factorization.

1331551255321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190221607910.

The product of its digits is 67500, while the sum is 37.

The spelling of 1331551255321 in words is "one trillion, three hundred thirty-one billion, five hundred fifty-one million, two hundred fifty-five thousand, three hundred twenty-one".