670047221 has 2 divisors, whose sum is σ = 670047222. Its totient is φ = 670047220.

The previous prime is 670047167. The next prime is 670047223. The reversal of 670047221 is 122740076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 669256900 + 790321 = 25870^2 + 889^2 .

It is a cyclic number.

It is not a de Polignac number, because 670047221 - 2¹⁰ = 670046197 is a prime.

Together with 670047223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (670047223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335023610 + 335023611.

It is an arithmetic number, because the mean of its divisors is an integer number (335023611).

Almost surely, 2^670047221 is an apocalyptic number.

It is an amenable number.

670047221 is a deficient number, since it is larger than the sum of its proper divisors (1).

670047221 is an equidigital number, since it uses as much as digits as its factorization.

670047221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 670047221 is about 25885.2703482115. The cubic root of 670047221 is about 875.0545690049.

Adding to 670047221 its reverse (122740076), we get a palindrome (792787297).

The spelling of 670047221 in words is "six hundred seventy million, forty-seven thousand, two hundred twenty-one".