383799398752921 has 2 divisors, whose sum is σ = 383799398752922. Its totient is φ = 383799398752920.

The previous prime is 383799398752901. The next prime is 383799398752943. The reversal of 383799398752921 is 129257893997383.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196595844157696 + 187203554595225 = 14021264^2 + 13682235^2 .

It is a cyclic number.

It is not a de Polignac number, because 383799398752921 - 2³¹ = 383797251269273 is a prime.

It is not a weakly prime, because it can be changed into another prime (383799398752901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 191899699376460 + 191899699376461.

It is an arithmetic number, because the mean of its divisors is an integer number (191899699376461).

Almost surely, 2^{383799398752921} is an apocalyptic number.

It is an amenable number.

383799398752921 is a deficient number, since it is larger than the sum of its proper divisors (1).

383799398752921 is an equidigital number, since it uses as much as digits as its factorization.

383799398752921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11110659840, while the sum is 85.

The spelling of 383799398752921 in words is "three hundred eighty-three trillion, seven hundred ninety-nine billion, three hundred ninety-eight million, seven hundred fifty-two thousand, nine hundred twenty-one".