33212540 has 48 divisors (see below), whose sum is σ = 72787680. Its totient is φ = 12714240.

The previous prime is 33212539. The next prime is 33212549. The reversal of 33212540 is 4521233.

It is a happy number.

It is a super-2 number, since 2×33212540² = 2206145626503200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33212549) 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, 100175 + ... + 100505.

It is an arithmetic number, because the mean of its divisors is an integer number (1516410).

Almost surely, 2^33212540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 33212540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36393840).

33212540 is an abundant number, since it is smaller than the sum of its proper divisors (39575140).

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

33212540 is a wasteful number, since it uses less digits than its factorization.

33212540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542 (or 540 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 33212540 is about 5763.0321880066. The cubic root of 33212540 is about 321.4405754012.

Adding to 33212540 its reverse (4521233), we get a palindrome (37733773).

The spelling of 33212540 in words is "thirty-three million, two hundred twelve thousand, five hundred forty".