221374206 has 24 divisors (see below), whose sum is σ = 504889320. Its totient is φ = 69907536.

The previous prime is 221374189. The next prime is 221374229. The reversal of 221374206 is 602473122.

It is a self number, because there is not a number n which added to its sum of digits gives 221374206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 323305 + ... + 323988.

It is an arithmetic number, because the mean of its divisors is an integer number (21037055).

Almost surely, 2^221374206 is an apocalyptic number.

221374206 is an abundant number, since it is smaller than the sum of its proper divisors (283515114).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221374206 is a wasteful number, since it uses less digits than its factorization.

221374206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647320 (or 647317 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 221374206 is about 14878.6493338609. The cubic root of 221374206 is about 604.9354082626.

The spelling of 221374206 in words is "two hundred twenty-one million, three hundred seventy-four thousand, two hundred six".