21276859943 has 2 divisors, whose sum is σ = 21276859944. Its totient is φ = 21276859942.

The previous prime is 21276859931. The next prime is 21276859973. The reversal of 21276859943 is 34995867212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21276859943 - 2¹⁰ = 21276858919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21276859913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10638429971 + 10638429972.

It is an arithmetic number, because the mean of its divisors is an integer number (10638429972).

Almost surely, 2^21276859943 is an apocalyptic number.

21276859943 is a deficient number, since it is larger than the sum of its proper divisors (1).

21276859943 is an equidigital number, since it uses as much as digits as its factorization.

21276859943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6531840, while the sum is 56.

The spelling of 21276859943 in words is "twenty-one billion, two hundred seventy-six million, eight hundred fifty-nine thousand, nine hundred forty-three".