3633213721 has 2 divisors, whose sum is σ = 3633213722. Its totient is φ = 3633213720.

The previous prime is 3633213707. The next prime is 3633213743. The reversal of 3633213721 is 1273123363.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3464499600 + 168714121 = 58860^2 + 12989^2 .

It is a cyclic number.

It is not a de Polignac number, because 3633213721 - 2⁷ = 3633213593 is a prime.

It is not a weakly prime, because it can be changed into another prime (3633213781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1816606860 + 1816606861.

It is an arithmetic number, because the mean of its divisors is an integer number (1816606861).

Almost surely, 2^3633213721 is an apocalyptic number.

It is an amenable number.

3633213721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3633213721 is an equidigital number, since it uses as much as digits as its factorization.

3633213721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 31.

The square root of 3633213721 is about 60276.1455386789. The cubic root of 3633213721 is about 1537.3177745653.

The spelling of 3633213721 in words is "three billion, six hundred thirty-three million, two hundred thirteen thousand, seven hundred twenty-one".