2309349785921 has 2 divisors, whose sum is σ = 2309349785922. Its totient is φ = 2309349785920.

The previous prime is 2309349785917. The next prime is 2309349785929. The reversal of 2309349785921 is 1295879439032.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1920541418896 + 388808367025 = 1385836^2 + 623545^2 .

It is a cyclic number.

It is not a de Polignac number, because 2309349785921 - 2² = 2309349785917 is a prime.

It is not a weakly prime, because it can be changed into another prime (2309349785929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1154674892960 + 1154674892961.

It is an arithmetic number, because the mean of its divisors is an integer number (1154674892961).

Almost surely, 2^{2309349785921} is an apocalyptic number.

It is an amenable number.

2309349785921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2309349785921 is an equidigital number, since it uses as much as digits as its factorization.

2309349785921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29393280, while the sum is 62.

The spelling of 2309349785921 in words is "two trillion, three hundred nine billion, three hundred forty-nine million, seven hundred eighty-five thousand, nine hundred twenty-one".