70157221 has 2 divisors, whose sum is σ = 70157222. Its totient is φ = 70157220.

The previous prime is 70157203. The next prime is 70157231. The reversal of 70157221 is 12275107.

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., 39753025 + 30404196 = 6305^2 + 5514^2 .

It is a cyclic number.

It is not a de Polignac number, because 70157221 - 2¹³ = 70149029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70157231) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35078610 + 35078611.

It is an arithmetic number, because the mean of its divisors is an integer number (35078611).

Almost surely, 2^70157221 is an apocalyptic number.

It is an amenable number.

70157221 is a deficient number, since it is larger than the sum of its proper divisors (1).

70157221 is an equidigital number, since it uses as much as digits as its factorization.

70157221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 70157221 is about 8375.9907473683. The cubic root of 70157221 is about 412.4368481222.

The spelling of 70157221 in words is "seventy million, one hundred fifty-seven thousand, two hundred twenty-one".