1670719021 has 2 divisors, whose sum is σ = 1670719022. Its totient is φ = 1670719020.

The previous prime is 1670719007. The next prime is 1670719051. The reversal of 1670719021 is 1209170761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1166222500 + 504496521 = 34150^2 + 22461^2 .

It is a cyclic number.

It is not a de Polignac number, because 1670719021 - 2²⁵ = 1637164589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1670719051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835359510 + 835359511.

It is an arithmetic number, because the mean of its divisors is an integer number (835359511).

Almost surely, 2^1670719021 is an apocalyptic number.

It is an amenable number.

1670719021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1670719021 is an equidigital number, since it uses as much as digits as its factorization.

1670719021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 34.

The square root of 1670719021 is about 40874.4299165138. The cubic root of 1670719021 is about 1186.5912432161.

Adding to 1670719021 its reverse (1209170761), we get a palindrome (2879889782).

The spelling of 1670719021 in words is "one billion, six hundred seventy million, seven hundred nineteen thousand, twenty-one".