210796721 has 2 divisors, whose sum is σ = 210796722. Its totient is φ = 210796720.

The previous prime is 210796717. The next prime is 210796757. The reversal of 210796721 is 127697012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208513600 + 2283121 = 14440^2 + 1511^2 .

It is a cyclic number.

It is not a de Polignac number, because 210796721 - 2² = 210796717 is a prime.

It is not a weakly prime, because it can be changed into another prime (210795721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105398360 + 105398361.

It is an arithmetic number, because the mean of its divisors is an integer number (105398361).

Almost surely, 2^210796721 is an apocalyptic number.

It is an amenable number.

210796721 is a deficient number, since it is larger than the sum of its proper divisors (1).

210796721 is an equidigital number, since it uses as much as digits as its factorization.

210796721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 210796721 is about 14518.8402085015. The cubic root of 210796721 is about 595.1429367304.

The spelling of 210796721 in words is "two hundred ten million, seven hundred ninety-six thousand, seven hundred twenty-one".