131243043234221 has 16 divisors (see below), whose sum is σ = 134953487655168. Its totient is φ = 127556948793600.

The previous prime is 131243043234211. The next prime is 131243043234253. The reversal of 131243043234221 is 122432340342131.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 131243043234221 - 2⁶ = 131243043234157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131243043234211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113233385 + ... + 114386561.

It is an arithmetic number, because the mean of its divisors is an integer number (8434592978448).

Almost surely, 2^{131243043234221} is an apocalyptic number.

It is an amenable number.

131243043234221 is a deficient number, since it is larger than the sum of its proper divisors (3710444420947).

131243043234221 is a wasteful number, since it uses less digits than its factorization.

131243043234221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163732.

The product of its (nonzero) digits is 82944, while the sum is 35.

Adding to 131243043234221 its reverse (122432340342131), we get a palindrome (253675383576352).

The spelling of 131243043234221 in words is "one hundred thirty-one trillion, two hundred forty-three billion, forty-three million, two hundred thirty-four thousand, two hundred twenty-one".