33221143 has 4 divisors (see below), whose sum is σ = 33420240. Its totient is φ = 33022048.

The previous prime is 33221137. The next prime is 33221161. The reversal of 33221143 is 34112233.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34112233 = 3967 ⋅8599.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33221143 is a prime.

It is a super-2 number, since 2×33221143² = 2207288684452898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 33221143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33251143) 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, 99298 + ... + 99631.

It is an arithmetic number, because the mean of its divisors is an integer number (8355060).

Almost surely, 2^33221143 is an apocalyptic number.

33221143 is a deficient number, since it is larger than the sum of its proper divisors (199097).

33221143 is a wasteful number, since it uses less digits than its factorization.

33221143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199096.

The product of its digits is 432, while the sum is 19.

The square root of 33221143 is about 5763.7785349543. The cubic root of 33221143 is about 321.4683271132.

Adding to 33221143 its reverse (34112233), we get a palindrome (67333376).

It can be divided in two parts, 3322 and 1143, that added together give a triangular number (4465 = T₉₄).

The spelling of 33221143 in words is "thirty-three million, two hundred twenty-one thousand, one hundred forty-three".