31235221303421 has 2 divisors, whose sum is σ = 31235221303422. Its totient is φ = 31235221303420.

The previous prime is 31235221303379. The next prime is 31235221303483. The reversal of 31235221303421 is 12430312253213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26046620680921 + 5188600622500 = 5103589^2 + 2277850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31235221303421 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31235221323421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15617610651710 + 15617610651711.

It is an arithmetic number, because the mean of its divisors is an integer number (15617610651711).

Almost surely, 2^{31235221303421} is an apocalyptic number.

It is an amenable number.

31235221303421 is a deficient number, since it is larger than the sum of its proper divisors (1).

31235221303421 is an equidigital number, since it uses as much as digits as its factorization.

31235221303421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 32.

Adding to 31235221303421 its reverse (12430312253213), we get a palindrome (43665533556634).

The spelling of 31235221303421 in words is "thirty-one trillion, two hundred thirty-five billion, two hundred twenty-one million, three hundred three thousand, four hundred twenty-one".