70297021 has 2 divisors, whose sum is σ = 70297022. Its totient is φ = 70297020.

The previous prime is 70296997. The next prime is 70297037. The reversal of 70297021 is 12079207.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59505796 + 10791225 = 7714^2 + 3285^2 .

It is a cyclic number.

It is not a de Polignac number, because 70297021 - 2⁷ = 70296893 is a prime.

It is a super-2 number, since 2×70297021² = 9883342322948882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70297081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35148510 + 35148511.

It is an arithmetic number, because the mean of its divisors is an integer number (35148511).

Almost surely, 2^70297021 is an apocalyptic number.

It is an amenable number.

70297021 is a deficient number, since it is larger than the sum of its proper divisors (1).

70297021 is an equidigital number, since it uses as much as digits as its factorization.

70297021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 70297021 is about 8384.3318755879. The cubic root of 70297021 is about 412.7106161664.

The spelling of 70297021 in words is "seventy million, two hundred ninety-seven thousand, twenty-one".