21174581463349 has 2 divisors, whose sum is σ = 21174581463350. Its totient is φ = 21174581463348.

The previous prime is 21174581463281. The next prime is 21174581463379. The reversal of 21174581463349 is 94336418547112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19868548482225 + 1306032981124 = 4457415^2 + 1142818^2 .

It is a cyclic number.

It is not a de Polignac number, because 21174581463349 - 2²³ = 21174573074741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21174581463293 and 21174581463302.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21174581463379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10587290731674 + 10587290731675.

It is an arithmetic number, because the mean of its divisors is an integer number (10587290731675).

Almost surely, 2^{21174581463349} is an apocalyptic number.

It is an amenable number.

21174581463349 is a deficient number, since it is larger than the sum of its proper divisors (1).

21174581463349 is an equidigital number, since it uses as much as digits as its factorization.

21174581463349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17418240, while the sum is 58.

The spelling of 21174581463349 in words is "twenty-one trillion, one hundred seventy-four billion, five hundred eighty-one million, four hundred sixty-three thousand, three hundred forty-nine".