3244947907921 has 2 divisors, whose sum is σ = 3244947907922. Its totient is φ = 3244947907920.

The previous prime is 3244947907913. The next prime is 3244947908047. The reversal of 3244947907921 is 1297097494423.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1702659619600 + 1542288288321 = 1304860^2 + 1241889^2 .

It is an emirp because it is prime and its reverse (1297097494423) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3244947907921 - 2³ = 3244947907913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3244947907921.

It is not a weakly prime, because it can be changed into another prime (3244947907321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1622473953960 + 1622473953961.

It is an arithmetic number, because the mean of its divisors is an integer number (1622473953961).

Almost surely, 2^{3244947907921} is an apocalyptic number.

It is an amenable number.

3244947907921 is a deficient number, since it is larger than the sum of its proper divisors (1).

3244947907921 is an equidigital number, since it uses as much as digits as its factorization.

3244947907921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27433728, while the sum is 61.

The spelling of 3244947907921 in words is "three trillion, two hundred forty-four billion, nine hundred forty-seven million, nine hundred seven thousand, nine hundred twenty-one".