21276859973 has 2 divisors, whose sum is σ = 21276859974. Its totient is φ = 21276859972.

The previous prime is 21276859943. The next prime is 21276859979. The reversal of 21276859973 is 37995867212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11060097889 + 10216762084 = 105167^2 + 101078^2 .

It is a cyclic number.

It is not a de Polignac number, because 21276859973 - 2⁸ = 21276859717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21276859979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10638429986 + 10638429987.

It is an arithmetic number, because the mean of its divisors is an integer number (10638429987).

Almost surely, 2^21276859973 is an apocalyptic number.

It is an amenable number.

21276859973 is a deficient number, since it is larger than the sum of its proper divisors (1).

21276859973 is an equidigital number, since it uses as much as digits as its factorization.

21276859973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11430720, while the sum is 59.

The spelling of 21276859973 in words is "twenty-one billion, two hundred seventy-six million, eight hundred fifty-nine thousand, nine hundred seventy-three".