131402400234421 has 4 divisors (see below), whose sum is σ = 133556537943244. Its totient is φ = 129248262525600.

The previous prime is 131402400234397. The next prime is 131402400234437. The reversal of 131402400234421 is 124432004204131.

It is a happy number.

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 18105833459025 + 113296566775396 = 4255095^2 + 10644086^2 .

It is a cyclic number.

It is not a de Polignac number, because 131402400234421 - 2³¹ = 131400252750773 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 (131402400234451) 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, 1077068854320 + ... + 1077068854441.

It is an arithmetic number, because the mean of its divisors is an integer number (33389134485811).

Almost surely, 2^{131402400234421} is an apocalyptic number.

It is an amenable number.

131402400234421 is a deficient number, since it is larger than the sum of its proper divisors (2154137708823).

131402400234421 is an equidigital number, since it uses as much as digits as its factorization.

131402400234421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2154137708822.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 131402400234421 its reverse (124432004204131), we get a palindrome (255834404438552).

The spelling of 131402400234421 in words is "one hundred thirty-one trillion, four hundred two billion, four hundred million, two hundred thirty-four thousand, four hundred twenty-one".