187364221 has 16 divisors (see below), whose sum is σ = 208051200. Its totient is φ = 167310000.

The previous prime is 187364213. The next prime is 187364239. The reversal of 187364221 is 122463781.

It is not a de Polignac number, because 187364221 - 2³ = 187364213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187364291) 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, 217690 + ... + 218548.

It is an arithmetic number, because the mean of its divisors is an integer number (13003200).

Almost surely, 2^187364221 is an apocalyptic number.

187364221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

187364221 is a deficient number, since it is larger than the sum of its proper divisors (20686979).

187364221 is a wasteful number, since it uses less digits than its factorization.

187364221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1200.

The product of its digits is 16128, while the sum is 34.

The square root of 187364221 is about 13688.1050916480. The cubic root of 187364221 is about 572.2189295538.

The spelling of 187364221 in words is "one hundred eighty-seven million, three hundred sixty-four thousand, two hundred twenty-one".