31542105421 has 2 divisors, whose sum is σ = 31542105422. Its totient is φ = 31542105420.

The previous prime is 31542105391. The next prime is 31542105451. The reversal of 31542105421 is 12450124513.

It is a balanced prime because it is at equal distance from previous prime (31542105391) and next prime (31542105451).

It can be written as a sum of positive squares in only one way, i.e., 30598755625 + 943349796 = 174925^2 + 30714^2 .

It is an emirp because it is prime and its reverse (12450124513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31542105421 - 2²³ = 31533716813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31542105421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31542105451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15771052710 + 15771052711.

It is an arithmetic number, because the mean of its divisors is an integer number (15771052711).

Almost surely, 2^31542105421 is an apocalyptic number.

It is an amenable number.

31542105421 is a deficient number, since it is larger than the sum of its proper divisors (1).

31542105421 is an equidigital number, since it uses as much as digits as its factorization.

31542105421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 31542105421 its reverse (12450124513), we get a palindrome (43992229934).

The spelling of 31542105421 in words is "thirty-one billion, five hundred forty-two million, one hundred five thousand, four hundred twenty-one".