70430221 has 2 divisors, whose sum is σ = 70430222. Its totient is φ = 70430220.

The previous prime is 70430219. The next prime is 70430237. The reversal of 70430221 is 12203407.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70056900 + 373321 = 8370^2 + 611^2 .

It is a cyclic number.

It is not a de Polignac number, because 70430221 - 2¹ = 70430219 is a prime.

Together with 70430219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70430291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35215110 + 35215111.

It is an arithmetic number, because the mean of its divisors is an integer number (35215111).

Almost surely, 2^70430221 is an apocalyptic number.

It is an amenable number.

70430221 is a deficient number, since it is larger than the sum of its proper divisors (1).

70430221 is an equidigital number, since it uses as much as digits as its factorization.

70430221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 70430221 is about 8392.2715041876. The cubic root of 70430221 is about 412.9711220812.

Adding to 70430221 its reverse (12203407), we get a palindrome (82633628).

The spelling of 70430221 in words is "seventy million, four hundred thirty thousand, two hundred twenty-one".