131223120221 has 4 divisors (see below), whose sum is σ = 131225335200. Its totient is φ = 131220905244.

The previous prime is 131223120199. The next prime is 131223120227. The reversal of 131223120221 is 122021322131.

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 131223120221 - 2⁶ = 131223120157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131223120193 and 131223120202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131223120227) 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, 1016111 + ... + 1137948.

It is an arithmetic number, because the mean of its divisors is an integer number (32806333800).

Almost surely, 2^131223120221 is an apocalyptic number.

It is an amenable number.

131223120221 is a deficient number, since it is larger than the sum of its proper divisors (2214979).

131223120221 is an equidigital number, since it uses as much as digits as its factorization.

131223120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2214978.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 131223120221 its reverse (122021322131), we get a palindrome (253244442352).

The spelling of 131223120221 in words is "one hundred thirty-one billion, two hundred twenty-three million, one hundred twenty thousand, two hundred twenty-one".