221965331 has 8 divisors (see below), whose sum is σ = 260531040. Its totient is φ = 185113728.

The previous prime is 221965321. The next prime is 221965339. The reversal of 221965331 is 133569122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221965331 is a prime.

It is a super-2 number, since 2×221965331² = 98537216331879122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221965339) 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, 428246 + ... + 428763.

It is an arithmetic number, because the mean of its divisors is an integer number (32566380).

Almost surely, 2^221965331 is an apocalyptic number.

221965331 is a deficient number, since it is larger than the sum of its proper divisors (38565709).

221965331 is an equidigital number, since it uses as much as digits as its factorization.

221965331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857053.

The product of its digits is 9720, while the sum is 32.

The square root of 221965331 is about 14898.5009648622. The cubic root of 221965331 is about 605.4733731165.

The spelling of 221965331 in words is "two hundred twenty-one million, nine hundred sixty-five thousand, three hundred thirty-one".