21174582347749 has 2 divisors, whose sum is σ = 21174582347750. Its totient is φ = 21174582347748.

The previous prime is 21174582347741. The next prime is 21174582347803. The reversal of 21174582347749 is 94774328547112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18716162183524 + 2458420164225 = 4326218^2 + 1567935^2 .

It is a cyclic number.

It is not a de Polignac number, because 21174582347749 - 2³ = 21174582347741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21174582347741) 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, 10587291173874 + 10587291173875.

It is an arithmetic number, because the mean of its divisors is an integer number (10587291173875).

Almost surely, 2^{21174582347749} is an apocalyptic number.

It is an amenable number.

21174582347749 is a deficient number, since it is larger than the sum of its proper divisors (1).

21174582347749 is an equidigital number, since it uses as much as digits as its factorization.

21174582347749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94832640, while the sum is 64.

The spelling of 21174582347749 in words is "twenty-one trillion, one hundred seventy-four billion, five hundred eighty-two million, three hundred forty-seven thousand, seven hundred forty-nine".