221539090 has 8 divisors (see below), whose sum is σ = 398770380. Its totient is φ = 88615632.

The previous prime is 221539081. The next prime is 221539093. The reversal of 221539090 is 90935122.

It can be written as a sum of positive squares in 2 ways, for example, as 221384641 + 154449 = 14879^2 + 393^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (221539093) 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 3 ways as a sum of consecutive naturals, for example, 11076945 + ... + 11076964.

Almost surely, 2^221539090 is an apocalyptic number.

221539090 is a deficient number, since it is larger than the sum of its proper divisors (177231290).

221539090 is a wasteful number, since it uses less digits than its factorization.

221539090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22153916.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 221539090 is about 14884.1892624355. The cubic root of 221539090 is about 605.0855603784.

The spelling of 221539090 in words is "two hundred twenty-one million, five hundred thirty-nine thousand, ninety".