33131221011 has 12 divisors (see below), whose sum is σ = 54692809392. Its totient is φ = 18932126256.

The previous prime is 33131220989. The next prime is 33131221037. The reversal of 33131221011 is 11012213133.

33131221011 is a `hidden beast` number, since 331 + 312 + 2 + 10 + 11 = 666.

It is not a de Polignac number, because 33131221011 - 2¹⁰ = 33131219987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (33131221051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 262946136 + ... + 262946261.

It is an arithmetic number, because the mean of its divisors is an integer number (4557734116).

Almost surely, 2^33131221011 is an apocalyptic number.

33131221011 is a deficient number, since it is larger than the sum of its proper divisors (21561588381).

33131221011 is a wasteful number, since it uses less digits than its factorization.

33131221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525892410 (or 525892407 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 33131221011 its reverse (11012213133), we get a palindrome (44143434144).

It can be divided in two parts, 3313122 and 1011, that added together give a palindrome (3314133).

The spelling of 33131221011 in words is "thirty-three billion, one hundred thirty-one million, two hundred twenty-one thousand, eleven".