3121350360421 has 4 divisors (see below), whose sum is σ = 3228983131500. Its totient is φ = 3013717589344.

The previous prime is 3121350360383. The next prime is 3121350360433. The reversal of 3121350360421 is 1240630531213.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1427809908100 + 1693540452321 = 1194910^2 + 1301361^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121350360421 - 2²⁵ = 3121316805989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121350060421) 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, 53816385496 + ... + 53816385553.

It is an arithmetic number, because the mean of its divisors is an integer number (807245782875).

Almost surely, 2^{3121350360421} is an apocalyptic number.

It is an amenable number.

3121350360421 is a deficient number, since it is larger than the sum of its proper divisors (107632771079).

3121350360421 is a wasteful number, since it uses less digits than its factorization.

3121350360421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107632771078.

The product of its (nonzero) digits is 12960, while the sum is 31.

Adding to 3121350360421 its reverse (1240630531213), we get a palindrome (4361980891634).

The spelling of 3121350360421 in words is "three trillion, one hundred twenty-one billion, three hundred fifty million, three hundred sixty thousand, four hundred twenty-one".