21049095786493 has 2 divisors, whose sum is σ = 21049095786494. Its totient is φ = 21049095786492.

The previous prime is 21049095786401. The next prime is 21049095786613. The reversal of 21049095786493 is 39468759094012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17201076066724 + 3848019719769 = 4147418^2 + 1961637^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21049095786493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21049095786193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10524547893246 + 10524547893247.

It is an arithmetic number, because the mean of its divisors is an integer number (10524547893247).

It is a 1-persistent number, because it is pandigital, but 2⋅21049095786493 = 42098191572986 is not.

Almost surely, 2^{21049095786493} is an apocalyptic number.

It is an amenable number.

21049095786493 is a deficient number, since it is larger than the sum of its proper divisors (1).

21049095786493 is an equidigital number, since it uses as much as digits as its factorization.

21049095786493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 117573120, while the sum is 67.

The spelling of 21049095786493 in words is "twenty-one trillion, forty-nine billion, ninety-five million, seven hundred eighty-six thousand, four hundred ninety-three".