12021533131 has 4 divisors (see below), whose sum is σ = 12095285032. Its totient is φ = 11947781232.

The previous prime is 12021533113. The next prime is 12021533159. The reversal of 12021533131 is 13133512021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12021533131 - 2⁵ = 12021533099 is a prime.

It is a super-2 number, since 2×12021533131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021533191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36875706 + ... + 36876031.

It is an arithmetic number, because the mean of its divisors is an integer number (3023821258).

Almost surely, 2^12021533131 is an apocalyptic number.

12021533131 is a deficient number, since it is larger than the sum of its proper divisors (73751901).

12021533131 is an equidigital number, since it uses as much as digits as its factorization.

12021533131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73751900.

The product of its (nonzero) digits is 540, while the sum is 22.

The spelling of 12021533131 in words is "twelve billion, twenty-one million, five hundred thirty-three thousand, one hundred thirty-one".