21140344331 has 2 divisors, whose sum is σ = 21140344332. Its totient is φ = 21140344330.

The previous prime is 21140344279. The next prime is 21140344349. The reversal of 21140344331 is 13344304112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21140344331 - 2¹⁰ = 21140343307 is a prime.

It is a super-2 number, since 2×21140344331² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21140344331.

It is not a weakly prime, because it can be changed into another prime (21140344391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570172165 + 10570172166.

It is an arithmetic number, because the mean of its divisors is an integer number (10570172166).

Almost surely, 2^21140344331 is an apocalyptic number.

21140344331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21140344331 is an equidigital number, since it uses as much as digits as its factorization.

21140344331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 21140344331 its reverse (13344304112), we get a palindrome (34484648443).

The spelling of 21140344331 in words is "twenty-one billion, one hundred forty million, three hundred forty-four thousand, three hundred thirty-one".