12109309533 has 24 divisors (see below), whose sum is σ = 17956463616. Its totient is φ = 7858996800.

The previous prime is 12109309481. The next prime is 12109309543. The reversal of 12109309533 is 33590390121.

12109309533 is a `hidden beast` number, since 12 + 109 + 3 + 0 + 9 + 533 = 666.

It is not a de Polignac number, because 12109309533 - 2¹⁶ = 12109243997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12109309543) 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, 137188 + ... + 207458.

It is an arithmetic number, because the mean of its divisors is an integer number (748185984).

Almost surely, 2^12109309533 is an apocalyptic number.

It is an amenable number.

12109309533 is a deficient number, since it is larger than the sum of its proper divisors (5847154083).

12109309533 is a wasteful number, since it uses less digits than its factorization.

12109309533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70785 (or 70782 counting only the distinct ones).

The product of its (nonzero) digits is 21870, while the sum is 36.

Adding to 12109309533 its reverse (33590390121), we get a palindrome (45699699654).

The spelling of 12109309533 in words is "twelve billion, one hundred nine million, three hundred nine thousand, five hundred thirty-three".