33220231 has 4 divisors (see below), whose sum is σ = 36240264. Its totient is φ = 30200200.

The previous prime is 33220219. The next prime is 33220237. The reversal of 33220231 is 13202233.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 33220231 - 2⁵ = 33220199 is a prime.

It is a super-2 number, since 2×33220231² = 2207167495386722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33220237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1510000 + ... + 1510021.

It is an arithmetic number, because the mean of its divisors is an integer number (9060066).

Almost surely, 2^33220231 is an apocalyptic number.

33220231 is a deficient number, since it is larger than the sum of its proper divisors (3020033).

33220231 is a wasteful number, since it uses less digits than its factorization.

33220231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3020032.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 33220231 is about 5763.6994196436. The cubic root of 33220231 is about 321.4653853943.

Adding to 33220231 its reverse (13202233), we get a palindrome (46422464).

It can be divided in two parts, 332202 and 31, that added together give a palindrome (332233).

The spelling of 33220231 in words is "thirty-three million, two hundred twenty thousand, two hundred thirty-one".