33221340 has 60 divisors (see below), whose sum is σ = 104221656. Its totient is φ = 8858592.

The previous prime is 33221333. The next prime is 33221341. The reversal of 33221340 is 4312233.

33221340 is a `hidden beast` number, since 3 + 322 + 1 + 340 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×33221340² = 2207314862791200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33221341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8634 + ... + 11873.

Almost surely, 2^33221340 is an apocalyptic number.

33221340 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

33221340 is an abundant number, since it is smaller than the sum of its proper divisors (71000316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

33221340 is a wasteful number, since it uses less digits than its factorization.

33221340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20528 (or 20517 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 33221340 is about 5763.7956244128. The cubic root of 33221340 is about 321.4689625432.

Adding to 33221340 its reverse (4312233), we get a palindrome (37533573).

The spelling of 33221340 in words is "thirty-three million, two hundred twenty-one thousand, three hundred forty".