131223021023 has 4 divisors (see below), whose sum is σ = 131301740760. Its totient is φ = 131144301288.

The previous prime is 131223021019. The next prime is 131223021071. The reversal of 131223021023 is 320120322131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 320120322131 = 239119 ⋅1338749.

It is a cyclic number.

It is not a de Polignac number, because 131223021023 - 2² = 131223021019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131223020986 and 131223021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131223021073) 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, 39357368 + ... + 39360701.

It is an arithmetic number, because the mean of its divisors is an integer number (32825435190).

Almost surely, 2^131223021023 is an apocalyptic number.

131223021023 is a deficient number, since it is larger than the sum of its proper divisors (78719737).

131223021023 is an equidigital number, since it uses as much as digits as its factorization.

131223021023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78719736.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 131223021023 its reverse (320120322131), we get a palindrome (451343343154).

The spelling of 131223021023 in words is "one hundred thirty-one billion, two hundred twenty-three million, twenty-one thousand, twenty-three".