221339331 has 8 divisors (see below), whose sum is σ = 327910160. Its totient is φ = 147559536.

The previous prime is 221339329. The next prime is 221339359. The reversal of 221339331 is 133933122.

It is not a de Polignac number, because 221339331 - 2¹ = 221339329 is a prime.

It is a super-2 number, since 2×221339331² = 97982198895055122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 8197753 = 221339331 / (2 + 2 + 1 + 3 + 3 + 9 + 3 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221339295 and 221339304.

It is not an unprimeable number, because it can be changed into a prime (221339381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4098850 + ... + 4098903.

It is an arithmetic number, because the mean of its divisors is an integer number (40988770).

Almost surely, 2^221339331 is an apocalyptic number.

221339331 is a deficient number, since it is larger than the sum of its proper divisors (106570829).

221339331 is an equidigital number, since it uses as much as digits as its factorization.

221339331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8197762 (or 8197756 counting only the distinct ones).

The product of its digits is 2916, while the sum is 27.

The square root of 221339331 is about 14877.4773063178. The cubic root of 221339331 is about 604.9036396859.

The spelling of 221339331 in words is "two hundred twenty-one million, three hundred thirty-nine thousand, three hundred thirty-one".