214637221 has 16 divisors (see below), whose sum is σ = 222768000. Its totient is φ = 206712000.

The previous prime is 214637201. The next prime is 214637231. The reversal of 214637221 is 122736412.

214637221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-214637221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 214637221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (214637201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1078480 + ... + 1078678.

It is an arithmetic number, because the mean of its divisors is an integer number (13923000).

Almost surely, 2^214637221 is an apocalyptic number.

It is an amenable number.

214637221 is a deficient number, since it is larger than the sum of its proper divisors (8130779).

214637221 is a wasteful number, since it uses less digits than its factorization.

214637221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540.

The product of its digits is 4032, while the sum is 28.

The square root of 214637221 is about 14650.5024145932. The cubic root of 214637221 is about 598.7355045501.

The spelling of 214637221 in words is "two hundred fourteen million, six hundred thirty-seven thousand, two hundred twenty-one".