21252335413 has 2 divisors, whose sum is σ = 21252335414. Its totient is φ = 21252335412.

The previous prime is 21252335389. The next prime is 21252335441. The reversal of 21252335413 is 31453325212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21243937009 + 8398404 = 145753^2 + 2898^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21252335413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21252333413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10626167706 + 10626167707.

It is an arithmetic number, because the mean of its divisors is an integer number (10626167707).

Almost surely, 2^21252335413 is an apocalyptic number.

It is an amenable number.

21252335413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21252335413 is an equidigital number, since it uses as much as digits as its factorization.

21252335413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 31.

The spelling of 21252335413 in words is "twenty-one billion, two hundred fifty-two million, three hundred thirty-five thousand, four hundred thirteen".