131112021 has 4 divisors (see below), whose sum is σ = 174816032. Its totient is φ = 87408012.

The previous prime is 131112019. The next prime is 131112043. The reversal of 131112021 is 120211131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 131112021 - 2¹ = 131112019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131111988 and 131112006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131112001) 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, 21852001 + ... + 21852006.

It is an arithmetic number, because the mean of its divisors is an integer number (43704008).

Almost surely, 2^131112021 is an apocalyptic number.

It is an amenable number.

131112021 is a deficient number, since it is larger than the sum of its proper divisors (43704011).

131112021 is an equidigital number, since it uses as much as digits as its factorization.

131112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43704010.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 131112021 is about 11450.4157566439. The cubic root of 131112021 is about 508.0200317085.

Adding to 131112021 its reverse (120211131), we get a palindrome (251323152).

The spelling of 131112021 in words is "one hundred thirty-one million, one hundred twelve thousand, twenty-one".