221726490 has 32 divisors (see below), whose sum is σ = 544522176. Its totient is φ = 57751680.

The previous prime is 221726473. The next prime is 221726503. The reversal of 221726490 is 94627122.

221726490 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84651 + ... + 87230.

It is an arithmetic number, because the mean of its divisors is an integer number (17016318).

Almost surely, 2^221726490 is an apocalyptic number.

221726490 is an abundant number, since it is smaller than the sum of its proper divisors (322795686).

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

221726490 is a wasteful number, since it uses less digits than its factorization.

221726490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171934.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 221726490 is about 14890.4832023679. The cubic root of 221726490 is about 605.2561263283.

The spelling of 221726490 in words is "two hundred twenty-one million, seven hundred twenty-six thousand, four hundred ninety".