214428221 has 4 divisors (see below), whose sum is σ = 245060832. Its totient is φ = 183795612.

The previous prime is 214428169. The next prime is 214428257. The reversal of 214428221 is 122824412.

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 a de Polignac number, because none of the positive numbers 2^k-214428221 is a prime.

It is a super-2 number, since 2×214428221² = 91958923922449682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (214428421) 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 in 3 ways as a sum of consecutive naturals, for example, 15316295 + ... + 15316308.

It is an arithmetic number, because the mean of its divisors is an integer number (61265208).

Almost surely, 2^214428221 is an apocalyptic number.

It is an amenable number.

214428221 is a deficient number, since it is larger than the sum of its proper divisors (30632611).

214428221 is an equidigital number, since it uses as much as digits as its factorization.

214428221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30632610.

The product of its digits is 2048, while the sum is 26.

The square root of 214428221 is about 14643.3678161822. The cubic root of 214428221 is about 598.5411046564.

The spelling of 214428221 in words is "two hundred fourteen million, four hundred twenty-eight thousand, two hundred twenty-one".