33221440 has 56 divisors (see below), whose sum is σ = 90415872. Its totient is φ = 11389440.

The previous prime is 33221431. The next prime is 33221459. The reversal of 33221440 is 4412233.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×33221440² = 2207328151347200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5176 + ... + 9655.

Almost surely, 2^33221440 is an apocalyptic number.

It is an amenable number.

33221440 is an abundant number, since it is smaller than the sum of its proper divisors (57194432).

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

33221440 is a wasteful number, since it uses less digits than its factorization.

33221440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14855 (or 14845 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 33221440 is about 5763.8042992454. The cubic root of 33221440 is about 321.4692850956.

Adding to 33221440 its reverse (4412233), we get a palindrome (37633673).

The spelling of 33221440 in words is "thirty-three million, two hundred twenty-one thousand, four hundred forty".