131221241220413 has 4 divisors (see below), whose sum is σ = 131765727698748. Its totient is φ = 130676754742080.

The previous prime is 131221241220389. The next prime is 131221241220437. The reversal of 131221241220413 is 314022142122131.

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

It is an interprime number because it is at equal distance from previous prime (131221241220389) and next prime (131221241220437).

It can be written as a sum of positive squares in 2 ways, for example, as 47310914593849 + 83910326626564 = 6878293^2 + 9160258^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131221241220413 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 (131221241220463) 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, 272243238806 + ... + 272243239287.

It is an arithmetic number, because the mean of its divisors is an integer number (32941431924687).

Almost surely, 2^{131221241220413} is an apocalyptic number.

It is an amenable number.

131221241220413 is a deficient number, since it is larger than the sum of its proper divisors (544486478335).

131221241220413 is an equidigital number, since it uses as much as digits as its factorization.

131221241220413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544486478334.

The product of its (nonzero) digits is 4608, while the sum is 29.

Adding to 131221241220413 its reverse (314022142122131), we get a palindrome (445243383342544).

The spelling of 131221241220413 in words is "one hundred thirty-one trillion, two hundred twenty-one billion, two hundred forty-one million, two hundred twenty thousand, four hundred thirteen".