131444004232421 has 4 divisors (see below), whose sum is σ = 131486945759244. Its totient is φ = 131401062705600.

The previous prime is 131444004232417. The next prime is 131444004232427. The reversal of 131444004232421 is 124232400444131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 125834235667396 + 5609768565025 = 11217586^2 + 2368495^2 .

It is a cyclic number.

It is not a de Polignac number, because 131444004232421 - 2² = 131444004232417 is a prime.

It is a super-2 number, since 2×131444004232421² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131444004232427) 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, 21470758820 + ... + 21470764941.

It is an arithmetic number, because the mean of its divisors is an integer number (32871736439811).

Almost surely, 2^{131444004232421} is an apocalyptic number.

It is an amenable number.

131444004232421 is a deficient number, since it is larger than the sum of its proper divisors (42941526823).

131444004232421 is an equidigital number, since it uses as much as digits as its factorization.

131444004232421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42941526822.

The product of its (nonzero) digits is 73728, while the sum is 35.

Adding to 131444004232421 its reverse (124232400444131), we get a palindrome (255676404676552).

The spelling of 131444004232421 in words is "one hundred thirty-one trillion, four hundred forty-four billion, four million, two hundred thirty-two thousand, four hundred twenty-one".