245471021 has 2 divisors, whose sum is σ = 245471022. Its totient is φ = 245471020.

The previous prime is 245471011. The next prime is 245471027. The reversal of 245471021 is 120174542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 232410025 + 13060996 = 15245^2 + 3614^2 .

It is a cyclic number.

It is not a de Polignac number, because 245471021 - 2⁶ = 245470957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245471027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122735510 + 122735511.

It is an arithmetic number, because the mean of its divisors is an integer number (122735511).

Almost surely, 2^245471021 is an apocalyptic number.

It is an amenable number.

245471021 is a deficient number, since it is larger than the sum of its proper divisors (1).

245471021 is an equidigital number, since it uses as much as digits as its factorization.

245471021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 245471021 is about 15667.5148316509. The cubic root of 245471021 is about 626.1332153284.

The spelling of 245471021 in words is "two hundred forty-five million, four hundred seventy-one thousand, twenty-one".