21113011626493 has 2 divisors, whose sum is σ = 21113011626494. Its totient is φ = 21113011626492.

The previous prime is 21113011626491. The next prime is 21113011626529. The reversal of 21113011626493 is 39462611031112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15362425377049 + 5750586249444 = 3919493^2 + 2398038^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113011626493 - 2¹ = 21113011626491 is a prime.

Together with 21113011626491, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21113011626491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556505813246 + 10556505813247.

It is an arithmetic number, because the mean of its divisors is an integer number (10556505813247).

Almost surely, 2^{21113011626493} is an apocalyptic number.

It is an amenable number.

21113011626493 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113011626493 is an equidigital number, since it uses as much as digits as its factorization.

21113011626493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 40.

The spelling of 21113011626493 in words is "twenty-one trillion, one hundred thirteen billion, eleven million, six hundred twenty-six thousand, four hundred ninety-three".