131212021243 has 4 divisors (see below), whose sum is σ = 131219482680. Its totient is φ = 131204559808.

The previous prime is 131212021231. The next prime is 131212021249. The reversal of 131212021243 is 342120212131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342120212131 = 197 ⋅1736650823.

It is a cyclic number.

It is not a de Polignac number, because 131212021243 - 2¹⁷ = 131211890171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131212021249) 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, 3704278 + ... + 3739531.

It is an arithmetic number, because the mean of its divisors is an integer number (32804870670).

Almost surely, 2^131212021243 is an apocalyptic number.

131212021243 is a deficient number, since it is larger than the sum of its proper divisors (7461437).

131212021243 is an equidigital number, since it uses as much as digits as its factorization.

131212021243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7461436.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 131212021243 its reverse (342120212131), we get a palindrome (473332233374).

The spelling of 131212021243 in words is "one hundred thirty-one billion, two hundred twelve million, twenty-one thousand, two hundred forty-three".