214692721 has 2 divisors, whose sum is σ = 214692722. Its totient is φ = 214692720.

The previous prime is 214692703. The next prime is 214692743. The reversal of 214692721 is 127296412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165482496 + 49210225 = 12864^2 + 7015^2 .

It is a cyclic number.

It is not a de Polignac number, because 214692721 - 2¹⁵ = 214659953 is a prime.

It is not a weakly prime, because it can be changed into another prime (214692791) 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, 107346360 + 107346361.

It is an arithmetic number, because the mean of its divisors is an integer number (107346361).

Almost surely, 2^214692721 is an apocalyptic number.

It is an amenable number.

214692721 is a deficient number, since it is larger than the sum of its proper divisors (1).

214692721 is an equidigital number, since it uses as much as digits as its factorization.

214692721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The square root of 214692721 is about 14652.3964251586. The cubic root of 214692721 is about 598.7871062817.

The spelling of 214692721 in words is "two hundred fourteen million, six hundred ninety-two thousand, seven hundred twenty-one".