201921848939 has 2 divisors, whose sum is σ = 201921848940. Its totient is φ = 201921848938.

The previous prime is 201921848833. The next prime is 201921848941. The reversal of 201921848939 is 939848129102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201921848939 is a prime.

It is a Sophie Germain prime.

Together with 201921848941, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (201921848969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100960924469 + 100960924470.

It is an arithmetic number, because the mean of its divisors is an integer number (100960924470).

Almost surely, 2^201921848939 is an apocalyptic number.

201921848939 is a deficient number, since it is larger than the sum of its proper divisors (1).

201921848939 is an equidigital number, since it uses as much as digits as its factorization.

201921848939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2239488, while the sum is 56.

The spelling of 201921848939 in words is "two hundred one billion, nine hundred twenty-one million, eight hundred forty-eight thousand, nine hundred thirty-nine".