670211021 has 2 divisors, whose sum is σ = 670211022. Its totient is φ = 670211020.

The previous prime is 670210999. The next prime is 670211027. The reversal of 670211021 is 120112076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 670084996 + 126025 = 25886^2 + 355^2 .

It is a cyclic number.

It is not a de Polignac number, because 670211021 - 2²² = 666016717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 670210984 and 670211002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (670211027) 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, 335105510 + 335105511.

It is an arithmetic number, because the mean of its divisors is an integer number (335105511).

Almost surely, 2^670211021 is an apocalyptic number.

It is an amenable number.

670211021 is a deficient number, since it is larger than the sum of its proper divisors (1).

670211021 is an equidigital number, since it uses as much as digits as its factorization.

670211021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 670211021 is about 25888.4341164158. The cubic root of 670211021 is about 875.1258685868.

Adding to 670211021 its reverse (120112076), we get a palindrome (790323097).

The spelling of 670211021 in words is "six hundred seventy million, two hundred eleven thousand, twenty-one".