12131112021 has 32 divisors (see below), whose sum is σ = 19006611456. Its totient is φ = 6737904000.

The previous prime is 12131111999. The next prime is 12131112101. The reversal of 12131112021 is 12021113121.

It is not a de Polignac number, because 12131112021 - 2¹⁵ = 12131079253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131112421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 207336 + ... + 259326.

It is an arithmetic number, because the mean of its divisors is an integer number (593956608).

Almost surely, 2^12131112021 is an apocalyptic number.

It is an amenable number.

12131112021 is a deficient number, since it is larger than the sum of its proper divisors (6875499435).

12131112021 is a wasteful number, since it uses less digits than its factorization.

12131112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52313.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 12131112021 its reverse (12021113121), we get a palindrome (24152225142).

The spelling of 12131112021 in words is "twelve billion, one hundred thirty-one million, one hundred twelve thousand, twenty-one".