21140344279 has 2 divisors, whose sum is σ = 21140344280. Its totient is φ = 21140344278.

The previous prime is 21140344249. The next prime is 21140344331. The reversal of 21140344279 is 97244304112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21140344279 - 2²¹ = 21138247127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21140344249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570172139 + 10570172140.

It is an arithmetic number, because the mean of its divisors is an integer number (10570172140).

Almost surely, 2^21140344279 is an apocalyptic number.

21140344279 is a deficient number, since it is larger than the sum of its proper divisors (1).

21140344279 is an equidigital number, since it uses as much as digits as its factorization.

21140344279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 37.

The spelling of 21140344279 in words is "twenty-one billion, one hundred forty million, three hundred forty-four thousand, two hundred seventy-nine".