214087721 has 4 divisors (see below), whose sum is σ = 214170372. Its totient is φ = 214005072.

The previous prime is 214087697. The next prime is 214087729. The reversal of 214087721 is 127780412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36132121 + 177955600 = 6011^2 + 13340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-214087721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (214087729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37310 + ... + 42663.

It is an arithmetic number, because the mean of its divisors is an integer number (53542593).

Almost surely, 2^214087721 is an apocalyptic number.

It is an amenable number.

214087721 is a deficient number, since it is larger than the sum of its proper divisors (82651).

214087721 is an equidigital number, since it uses as much as digits as its factorization.

214087721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82650.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 214087721 is about 14631.7367731927. The cubic root of 214087721 is about 598.2241202339.

The spelling of 214087721 in words is "two hundred fourteen million, eighty-seven thousand, seven hundred twenty-one".