33121640 has 32 divisors (see below), whose sum is σ = 76930560. Its totient is φ = 12820800.

The previous prime is 33121639. The next prime is 33121663. The reversal of 33121640 is 4612133.

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

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, 12116 + ... + 14595.

It is an arithmetic number, because the mean of its divisors is an integer number (2404080).

Almost surely, 2^33121640 is an apocalyptic number.

It is an amenable number.

33121640 is an abundant number, since it is smaller than the sum of its proper divisors (43808920).

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

33121640 is a wasteful number, since it uses less digits than its factorization.

33121640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26753 (or 26749 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 33121640 is about 5755.1403110611. The cubic root of 33121640 is about 321.1470552877.

Adding to 33121640 its reverse (4612133), we get a palindrome (37733773).

The spelling of 33121640 in words is "thirty-three million, one hundred twenty-one thousand, six hundred forty".