70375021 has 2 divisors, whose sum is σ = 70375022. Its totient is φ = 70375020.

The previous prime is 70375013. The next prime is 70375051. The reversal of 70375021 is 12057307.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61308900 + 9066121 = 7830^2 + 3011^2 .

It is an emirp because it is prime and its reverse (12057307) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70375021 - 2³ = 70375013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70375051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35187510 + 35187511.

It is an arithmetic number, because the mean of its divisors is an integer number (35187511).

Almost surely, 2^70375021 is an apocalyptic number.

It is an amenable number.

70375021 is a deficient number, since it is larger than the sum of its proper divisors (1).

70375021 is an equidigital number, since it uses as much as digits as its factorization.

70375021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1470, while the sum is 25.

The square root of 70375021 is about 8388.9821194231. The cubic root of 70375021 is about 412.8632045627.

The spelling of 70375021 in words is "seventy million, three hundred seventy-five thousand, twenty-one".