221041290 has 32 divisors (see below), whose sum is σ = 536466240. Its totient is φ = 58281344.

The previous prime is 221041267. The next prime is 221041297. The reversal of 221041290 is 92140122.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221041297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38724 + ... + 44063.

It is an arithmetic number, because the mean of its divisors is an integer number (16764570).

Almost surely, 2^221041290 is an apocalyptic number.

221041290 is an abundant number, since it is smaller than the sum of its proper divisors (315424950).

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

221041290 is a wasteful number, since it uses less digits than its factorization.

221041290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82886.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 221041290 is about 14867.4574154426. The cubic root of 221041290 is about 604.6320098978.

The spelling of 221041290 in words is "two hundred twenty-one million, forty-one thousand, two hundred ninety".