50420921 has 2 divisors, whose sum is σ = 50420922. Its totient is φ = 50420920.

The previous prime is 50420873. The next prime is 50420933. The reversal of 50420921 is 12902405.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34058896 + 16362025 = 5836^2 + 4045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50420921 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (50420971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25210460 + 25210461.

It is an arithmetic number, because the mean of its divisors is an integer number (25210461).

Almost surely, 2^50420921 is an apocalyptic number.

It is an amenable number.

50420921 is a deficient number, since it is larger than the sum of its proper divisors (1).

50420921 is an equidigital number, since it uses as much as digits as its factorization.

50420921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 50420921 is about 7100.7690428573. The cubic root of 50420921 is about 369.4340532091.

The spelling of 50420921 in words is "fifty million, four hundred twenty thousand, nine hundred twenty-one".