33131323220 has 24 divisors (see below), whose sum is σ = 69732853344. Its totient is φ = 13222610336.

The previous prime is 33131323157. The next prime is 33131323231. The reversal of 33131323220 is 2232313133.

It is a super-2 number, since 2×33131323220² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1860854 + ... + 1878573.

It is an arithmetic number, because the mean of its divisors is an integer number (2905535556).

Almost surely, 2^33131323220 is an apocalyptic number.

It is an amenable number.

33131323220 is an abundant number, since it is smaller than the sum of its proper divisors (36601530124).

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

33131323220 is a wasteful number, since it uses less digits than its factorization.

33131323220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3739879 (or 3739877 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 33131323220 its reverse (2232313133), we get a palindrome (35363636353).

The spelling of 33131323220 in words is "thirty-three billion, one hundred thirty-one million, three hundred twenty-three thousand, two hundred twenty".