3315906907921 has 4 divisors (see below), whose sum is σ = 3315924247792. Its totient is φ = 3315889568052.

The previous prime is 3315906907919. The next prime is 3315906907931. The reversal of 3315906907921 is 1297096095133.

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 3315906907921 - 2¹ = 3315906907919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3315906907931) 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, 8379855 + ... + 8766628.

It is an arithmetic number, because the mean of its divisors is an integer number (828981061948).

Almost surely, 2^{3315906907921} is an apocalyptic number.

It is an amenable number.

3315906907921 is a deficient number, since it is larger than the sum of its proper divisors (17339871).

3315906907921 is a wasteful number, since it uses less digits than its factorization.

3315906907921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17339870.

The product of its (nonzero) digits is 2755620, while the sum is 55.

The spelling of 3315906907921 in words is "three trillion, three hundred fifteen billion, nine hundred six million, nine hundred seven thousand, nine hundred twenty-one".