321321052691 has 4 divisors (see below), whose sum is σ = 321329939112. Its totient is φ = 321312166272.

The previous prime is 321321052687. The next prime is 321321052693. The reversal of 321321052691 is 196250123123.

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 321321052691 - 2² = 321321052687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321321052693) 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, 4388750 + ... + 4461363.

It is an arithmetic number, because the mean of its divisors is an integer number (80332484778).

Almost surely, 2^321321052691 is an apocalyptic number.

321321052691 is a deficient number, since it is larger than the sum of its proper divisors (8886421).

321321052691 is an equidigital number, since it uses as much as digits as its factorization.

321321052691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8886420.

The product of its (nonzero) digits is 19440, while the sum is 35.

The spelling of 321321052691 in words is "three hundred twenty-one billion, three hundred twenty-one million, fifty-two thousand, six hundred ninety-one".