721042211 has 2 divisors, whose sum is σ = 721042212. Its totient is φ = 721042210.

The previous prime is 721042187. The next prime is 721042219. The reversal of 721042211 is 112240127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 721042211 - 2¹⁰ = 721041187 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (721042219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360521105 + 360521106.

It is an arithmetic number, because the mean of its divisors is an integer number (360521106).

Almost surely, 2^721042211 is an apocalyptic number.

721042211 is a deficient number, since it is larger than the sum of its proper divisors (1).

721042211 is an equidigital number, since it uses as much as digits as its factorization.

721042211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 721042211 is about 26852.2291625854. The cubic root of 721042211 is about 896.7132009373.

Adding to 721042211 its reverse (112240127), we get a palindrome (833282338).

The spelling of 721042211 in words is "seven hundred twenty-one million, forty-two thousand, two hundred eleven".