247075021 has 2 divisors, whose sum is σ = 247075022. Its totient is φ = 247075020.

The previous prime is 247075013. The next prime is 247075057. The reversal of 247075021 is 120570742.

247075021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158508100 + 88566921 = 12590^2 + 9411^2 .

It is a cyclic number.

It is not a de Polignac number, because 247075021 - 2³ = 247075013 is a prime.

It is a super-2 number, since 2×247075021² = 122092132004300882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247075121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123537510 + 123537511.

It is an arithmetic number, because the mean of its divisors is an integer number (123537511).

Almost surely, 2^247075021 is an apocalyptic number.

It is an amenable number.

247075021 is a deficient number, since it is larger than the sum of its proper divisors (1).

247075021 is an equidigital number, since it uses as much as digits as its factorization.

247075021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 247075021 is about 15718.6202002593. The cubic root of 247075021 is about 627.4940522073.

The spelling of 247075021 in words is "two hundred forty-seven million, seventy-five thousand, twenty-one".