70129021 has 2 divisors, whose sum is σ = 70129022. Its totient is φ = 70129020.

The previous prime is 70129013. The next prime is 70129027. The reversal of 70129021 is 12092107.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47803396 + 22325625 = 6914^2 + 4725^2 .

It is a cyclic number.

It is not a de Polignac number, because 70129021 - 2³ = 70129013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 70128983 and 70129001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70129027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35064510 + 35064511.

It is an arithmetic number, because the mean of its divisors is an integer number (35064511).

Almost surely, 2^70129021 is an apocalyptic number.

It is an amenable number.

70129021 is a deficient number, since it is larger than the sum of its proper divisors (1).

70129021 is an equidigital number, since it uses as much as digits as its factorization.

70129021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 70129021 is about 8374.3071952252. The cubic root of 70129021 is about 412.3815804551.

The spelling of 70129021 in words is "seventy million, one hundred twenty-nine thousand, twenty-one".