321220090 has 16 divisors (see below), whose sum is σ = 590499072. Its totient is φ = 125754064.

The previous prime is 321220087. The next prime is 321220103. The reversal of 321220090 is 90022123.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 341254 + ... + 342193.

It is an arithmetic number, because the mean of its divisors is an integer number (36906192).

Almost surely, 2^321220090 is an apocalyptic number.

321220090 is a deficient number, since it is larger than the sum of its proper divisors (269278982).

321220090 is a wasteful number, since it uses less digits than its factorization.

321220090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683501.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 321220090 is about 17922.6139276613. The cubic root of 321220090 is about 684.8585780827.

The spelling of 321220090 in words is "three hundred twenty-one million, two hundred twenty thousand, ninety".