33420221 has 4 divisors (see below), whose sum is σ = 35179200. Its totient is φ = 31661244.

The previous prime is 33420217. The next prime is 33420241. The reversal of 33420221 is 12202433.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12202433 = 337 ⋅36209.

It is a cyclic number.

It is not a de Polignac number, because 33420221 - 2² = 33420217 is a prime.

It is a super-2 number, since 2×33420221² = 2233822343377682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 33420221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33420241) 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, 879461 + ... + 879498.

It is an arithmetic number, because the mean of its divisors is an integer number (8794800).

Almost surely, 2^33420221 is an apocalyptic number.

It is an amenable number.

33420221 is a deficient number, since it is larger than the sum of its proper divisors (1758979).

33420221 is a wasteful number, since it uses less digits than its factorization.

33420221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758978.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 33420221 is about 5781.0224874152. The cubic root of 33420221 is about 322.1091826548.

Adding to 33420221 its reverse (12202433), we get a palindrome (45622654).

The spelling of 33420221 in words is "thirty-three million, four hundred twenty thousand, two hundred twenty-one".