33131130021 has 24 divisors (see below), whose sum is σ = 52319947680. Its totient is φ = 20035888800.

The previous prime is 33131130013. The next prime is 33131130023. The reversal of 33131130021 is 12003113133.

It is a happy number.

33131130021 is a `hidden beast` number, since 3 + 31 + 311 + 300 + 21 = 666.

It is not a de Polignac number, because 33131130021 - 2³ = 33131130013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 33131129976 and 33131130003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33131130023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 317331 + ... + 408608.

It is an arithmetic number, because the mean of its divisors is an integer number (2179997820).

Almost surely, 2^33131130021 is an apocalyptic number.

It is an amenable number.

33131130021 is a deficient number, since it is larger than the sum of its proper divisors (19188817659).

33131130021 is a wasteful number, since it uses less digits than its factorization.

33131130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726417 (or 726414 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 33131130021 its reverse (12003113133), we get a palindrome (45134243154).

The spelling of 33131130021 in words is "thirty-three billion, one hundred thirty-one million, one hundred thirty thousand, twenty-one".