214427721 has 4 divisors (see below), whose sum is σ = 285903632. Its totient is φ = 142951812.

The previous prime is 214427699. The next prime is 214427729. The reversal of 214427721 is 127724412.

214427721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 214427721 - 2²² = 210233417 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 (214427729) 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, 35737951 + ... + 35737956.

It is an arithmetic number, because the mean of its divisors is an integer number (71475908).

Almost surely, 2^214427721 is an apocalyptic number.

It is an amenable number.

214427721 is a deficient number, since it is larger than the sum of its proper divisors (71475911).

214427721 is an equidigital number, since it uses as much as digits as its factorization.

214427721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71475910.

The product of its digits is 6272, while the sum is 30.

The square root of 214427721 is about 14643.3507435969. The cubic root of 214427721 is about 598.5406394335.

The spelling of 214427721 in words is "two hundred fourteen million, four hundred twenty-seven thousand, seven hundred twenty-one".