131021444431421 has 16 divisors (see below), whose sum is σ = 132120394738560. Its totient is φ = 129926797713600.

The previous prime is 131021444431333. The next prime is 131021444431439. The reversal of 131021444431421 is 124134444120131.

It is a cyclic number.

It is not a de Polignac number, because 131021444431421 - 2¹⁰ = 131021444430397 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 (131021444431481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119156096 + ... + 120250646.

It is an arithmetic number, because the mean of its divisors is an integer number (8257524671160).

Almost surely, 2^{131021444431421} is an apocalyptic number.

It is an amenable number.

131021444431421 is a deficient number, since it is larger than the sum of its proper divisors (1098950307139).

131021444431421 is a wasteful number, since it uses less digits than its factorization.

131021444431421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096516.

The product of its (nonzero) digits is 36864, while the sum is 35.

Adding to 131021444431421 its reverse (124134444120131), we get a palindrome (255155888551552).

The spelling of 131021444431421 in words is "one hundred thirty-one trillion, twenty-one billion, four hundred forty-four million, four hundred thirty-one thousand, four hundred twenty-one".