131213121220321 has 16 divisors (see below), whose sum is σ = 165682333557504. Its totient is φ = 101250314947584.

The previous prime is 131213121220301. The next prime is 131213121220327. The reversal of 131213121220321 is 123022121312131.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131213121220321 is a prime.

It is a super-2 number, since 2×131213121220321² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131213121220327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23970242280 + ... + 23970247753.

It is an arithmetic number, because the mean of its divisors is an integer number (10355145847344).

Almost surely, 2^{131213121220321} is an apocalyptic number.

It is an amenable number.

131213121220321 is a deficient number, since it is larger than the sum of its proper divisors (34469212337183).

131213121220321 is a wasteful number, since it uses less digits than its factorization.

131213121220321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47940490080.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 131213121220321 its reverse (123022121312131), we get a palindrome (254235242532452).

The spelling of 131213121220321 in words is "one hundred thirty-one trillion, two hundred thirteen billion, one hundred twenty-one million, two hundred twenty thousand, three hundred twenty-one".