33218812 has 12 divisors (see below), whose sum is σ = 63417816. Its totient is φ = 15099440.

The previous prime is 33218807. The next prime is 33218813. The reversal of 33218812 is 21881233.

It is a super-2 number, since 2×33218812² = 2206978941382688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33218813) 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, 377443 + ... + 377530.

It is an arithmetic number, because the mean of its divisors is an integer number (5284818).

Almost surely, 2^33218812 is an apocalyptic number.

It is an amenable number.

33218812 is a deficient number, since it is larger than the sum of its proper divisors (30199004).

33218812 is a wasteful number, since it uses less digits than its factorization.

33218812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754988 (or 754986 counting only the distinct ones).

The product of its digits is 2304, while the sum is 28.

The square root of 33218812 is about 5763.5763203067. The cubic root of 33218812 is about 321.4608082048.

The spelling of 33218812 in words is "thirty-three million, two hundred eighteen thousand, eight hundred twelve".