33412221 has 24 divisors (see below), whose sum is σ = 49884120. Its totient is φ = 21534336.

The previous prime is 33412219. The next prime is 33412243. The reversal of 33412221 is 12221433.

33412221 is a `hidden beast` number, since 33 + 412 + 221 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4575321 + 28836900 = 2139^2 + 5370^2 .

It is not a de Polignac number, because 33412221 - 2¹ = 33412219 is a prime.

It is a super-2 number, since 2×33412221² = 2232753024305682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 33412194 and 33412203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33412271) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89391 + ... + 89763.

It is an arithmetic number, because the mean of its divisors is an integer number (2078505).

Almost surely, 2^33412221 is an apocalyptic number.

It is an amenable number.

33412221 is a deficient number, since it is larger than the sum of its proper divisors (16471899).

33412221 is a wasteful number, since it uses less digits than its factorization.

33412221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685 (or 682 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 33412221 is about 5780.3305268817. The cubic root of 33412221 is about 322.0834788641.

Adding to 33412221 its reverse (12221433), we get a palindrome (45633654).

It can be divided in two parts, 33412 and 221, that added together give a palindrome (33633).

The spelling of 33412221 in words is "thirty-three million, four hundred twelve thousand, two hundred twenty-one".