229570021 has 2 divisors, whose sum is σ = 229570022. Its totient is φ = 229570020.

The previous prime is 229569983. The next prime is 229570031. The reversal of 229570021 is 120075922.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216501796 + 13068225 = 14714^2 + 3615^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-229570021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (229570031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114785010 + 114785011.

It is an arithmetic number, because the mean of its divisors is an integer number (114785011).

Almost surely, 2^229570021 is an apocalyptic number.

It is an amenable number.

229570021 is a deficient number, since it is larger than the sum of its proper divisors (1).

229570021 is an equidigital number, since it uses as much as digits as its factorization.

229570021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 229570021 is about 15151.5682686645. The cubic root of 229570021 is about 612.3105250938.

The spelling of 229570021 in words is "two hundred twenty-nine million, five hundred seventy thousand, twenty-one".