131223221012 has 24 divisors (see below), whose sum is σ = 249753878472. Its totient is φ = 59964912000.

The previous prime is 131223220963. The next prime is 131223221027. The reversal of 131223221012 is 210122322131.

It can be written as a sum of positive squares in 4 ways, for example, as 1252876816 + 129970344196 = 35396^2 + 360514^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12487439 + ... + 12497942.

It is an arithmetic number, because the mean of its divisors is an integer number (10406411603).

Almost surely, 2^131223221012 is an apocalyptic number.

It is an amenable number.

131223221012 is a deficient number, since it is larger than the sum of its proper divisors (118530657460).

131223221012 is a wasteful number, since it uses less digits than its factorization.

131223221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24985499 (or 24985497 counting only the distinct ones).

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

Adding to 131223221012 its reverse (210122322131), we get a palindrome (341345543143).

The spelling of 131223221012 in words is "one hundred thirty-one billion, two hundred twenty-three million, two hundred twenty-one thousand, twelve".