214912721 has 4 divisors (see below), whose sum is σ = 218967732. Its totient is φ = 210857712.

The previous prime is 214912681. The next prime is 214912723. The reversal of 214912721 is 127219412.

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 131446225 + 83466496 = 11465^2 + 9136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-214912721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (214912723) 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, 2027426 + ... + 2027531.

It is an arithmetic number, because the mean of its divisors is an integer number (54741933).

Almost surely, 2^214912721 is an apocalyptic number.

It is an amenable number.

214912721 is a deficient number, since it is larger than the sum of its proper divisors (4055011).

214912721 is an equidigital number, since it uses as much as digits as its factorization.

214912721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4055010.

The product of its digits is 2016, while the sum is 29.

The square root of 214912721 is about 14659.9018073110. The cubic root of 214912721 is about 598.9915662370.

The spelling of 214912721 in words is "two hundred fourteen million, nine hundred twelve thousand, seven hundred twenty-one".