21152009853307 has 2 divisors, whose sum is σ = 21152009853308. Its totient is φ = 21152009853306.

The previous prime is 21152009853287. The next prime is 21152009853319. The reversal of 21152009853307 is 70335890025112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21152009853307 is a prime.

It is not a weakly prime, because it can be changed into another prime (21152009853907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10576004926653 + 10576004926654.

It is an arithmetic number, because the mean of its divisors is an integer number (10576004926654).

Almost surely, 2^{21152009853307} is an apocalyptic number.

21152009853307 is a deficient number, since it is larger than the sum of its proper divisors (1).

21152009853307 is an equidigital number, since it uses as much as digits as its factorization.

21152009853307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 46.

Adding to 21152009853307 its reverse (70335890025112), we get a palindrome (91487899878419).

The spelling of 21152009853307 in words is "twenty-one trillion, one hundred fifty-two billion, nine million, eight hundred fifty-three thousand, three hundred seven".