33445221 has 16 divisors (see below), whose sum is σ = 45374400. Its totient is φ = 21909888.

The previous prime is 33445219. The next prime is 33445229. The reversal of 33445221 is 12254433.

It is not a de Polignac number, because 33445221 - 2¹ = 33445219 is a prime.

It is a super-2 number, since 2×33445221² = 2237165615477682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 33445191 and 33445200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33445229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60870 + ... + 61416.

It is an arithmetic number, because the mean of its divisors is an integer number (2835900).

Almost surely, 2^33445221 is an apocalyptic number.

It is an amenable number.

33445221 is a deficient number, since it is larger than the sum of its proper divisors (11929179).

33445221 is a wasteful number, since it uses less digits than its factorization.

33445221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868.

The product of its digits is 2880, while the sum is 24.

The square root of 33445221 is about 5783.1843304532. The cubic root of 33445221 is about 322.1894805724.

Adding to 33445221 its reverse (12254433), we get a palindrome (45699654).

The spelling of 33445221 in words is "thirty-three million, four hundred forty-five thousand, two hundred twenty-one".