674368021 has 2 divisors, whose sum is σ = 674368022. Its totient is φ = 674368020.

The previous prime is 674368003. The next prime is 674368033. The reversal of 674368021 is 120863476.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 531302500 + 143065521 = 23050^2 + 11961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-674368021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (674368421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 337184010 + 337184011.

It is an arithmetic number, because the mean of its divisors is an integer number (337184011).

Almost surely, 2^674368021 is an apocalyptic number.

It is an amenable number.

674368021 is a deficient number, since it is larger than the sum of its proper divisors (1).

674368021 is an equidigital number, since it uses as much as digits as its factorization.

674368021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 674368021 is about 25968.5968238563. The cubic root of 674368021 is about 876.9314703794.

It can be divided in two parts, 67436 and 8021, that added together give a palindrome (75457).

The spelling of 674368021 in words is "six hundred seventy-four million, three hundred sixty-eight thousand, twenty-one".