131123021 has 4 divisors (see below), whose sum is σ = 131151072. Its totient is φ = 131094972.

The previous prime is 131122969. The next prime is 131123029. The reversal of 131123021 is 120321131.

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 a cyclic number.

It is not a de Polignac number, because 131123021 - 2¹⁰ = 131121997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131122987 and 131123005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131123029) 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, 5135 + ... + 16988.

It is an arithmetic number, because the mean of its divisors is an integer number (32787768).

Almost surely, 2^131123021 is an apocalyptic number.

It is an amenable number.

131123021 is a deficient number, since it is larger than the sum of its proper divisors (28051).

131123021 is an equidigital number, since it uses as much as digits as its factorization.

131123021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28050.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 131123021 is about 11450.8960784735. The cubic root of 131123021 is about 508.0342385525.

Adding to 131123021 its reverse (120321131), we get a palindrome (251444152).

The spelling of 131123021 in words is "one hundred thirty-one million, one hundred twenty-three thousand, twenty-one".