12531220531442 has 4 divisors (see below), whose sum is σ = 18796830797166. Its totient is φ = 6265610265720.

The previous prime is 12531220531367. The next prime is 12531220531451. The reversal of 12531220531442 is 24413502213521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7774455169441 + 4756765362001 = 2788271^2 + 2181001^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3132805132859 + ... + 3132805132862.

Almost surely, 2^{12531220531442} is an apocalyptic number.

12531220531442 is a deficient number, since it is larger than the sum of its proper divisors (6265610265724).

12531220531442 is an equidigital number, since it uses as much as digits as its factorization.

12531220531442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6265610265723.

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 12531220531442 its reverse (24413502213521), we get a palindrome (36944722744963).

The spelling of 12531220531442 in words is "twelve trillion, five hundred thirty-one billion, two hundred twenty million, five hundred thirty-one thousand, four hundred forty-two".