21741658843 has 2 divisors, whose sum is σ = 21741658844. Its totient is φ = 21741658842.

The previous prime is 21741658727. The next prime is 21741658847. The reversal of 21741658843 is 34885614712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21741658843 - 2²¹ = 21739561691 is a prime.

It is not a weakly prime, because it can be changed into another prime (21741658847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10870829421 + 10870829422.

It is an arithmetic number, because the mean of its divisors is an integer number (10870829422).

Almost surely, 2^21741658843 is an apocalyptic number.

21741658843 is a deficient number, since it is larger than the sum of its proper divisors (1).

21741658843 is an equidigital number, since it uses as much as digits as its factorization.

21741658843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1290240, while the sum is 49.

The spelling of 21741658843 in words is "twenty-one billion, seven hundred forty-one million, six hundred fifty-eight thousand, eight hundred forty-three".