21140344349 has 2 divisors, whose sum is σ = 21140344350. Its totient is φ = 21140344348.

The previous prime is 21140344331. The next prime is 21140344363. The reversal of 21140344349 is 94344304112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20972253124 + 168091225 = 144818^2 + 12965^2 .

It is a cyclic number.

It is not a de Polignac number, because 21140344349 - 2³² = 16845377053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21140344399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570172174 + 10570172175.

It is an arithmetic number, because the mean of its divisors is an integer number (10570172175).

Almost surely, 2^21140344349 is an apocalyptic number.

It is an amenable number.

21140344349 is a deficient number, since it is larger than the sum of its proper divisors (1).

21140344349 is an equidigital number, since it uses as much as digits as its factorization.

21140344349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 35.

The spelling of 21140344349 in words is "twenty-one billion, one hundred forty million, three hundred forty-four thousand, three hundred forty-nine".