5631670021 has 2 divisors, whose sum is σ = 5631670022. Its totient is φ = 5631670020.

The previous prime is 5631670001. The next prime is 5631670043. The reversal of 5631670021 is 1200761365.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4068653796 + 1563016225 = 63786^2 + 39535^2 .

It is a cyclic number.

It is not a de Polignac number, because 5631670021 - 2⁷ = 5631669893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5631670001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2815835010 + 2815835011.

It is an arithmetic number, because the mean of its divisors is an integer number (2815835011).

Almost surely, 2^5631670021 is an apocalyptic number.

It is an amenable number.

5631670021 is a deficient number, since it is larger than the sum of its proper divisors (1).

5631670021 is an equidigital number, since it uses as much as digits as its factorization.

5631670021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 5631670021 is about 75044.4536324971. The cubic root of 5631670021 is about 1779.1493242992.

The spelling of 5631670021 in words is "five billion, six hundred thirty-one million, six hundred seventy thousand, twenty-one".