21299048273 has 2 divisors, whose sum is σ = 21299048274. Its totient is φ = 21299048272.

The previous prime is 21299048219. The next prime is 21299048293. The reversal of 21299048273 is 37284099212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16534873744 + 4764174529 = 128588^2 + 69023^2 .

It is a cyclic number.

It is not a de Polignac number, because 21299048273 - 2⁶ = 21299048209 is a prime.

It is not a weakly prime, because it can be changed into another prime (21299048293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10649524136 + 10649524137.

It is an arithmetic number, because the mean of its divisors is an integer number (10649524137).

Almost surely, 2^21299048273 is an apocalyptic number.

It is an amenable number.

21299048273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21299048273 is an equidigital number, since it uses as much as digits as its factorization.

21299048273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 21299048273 in words is "twenty-one billion, two hundred ninety-nine million, forty-eight thousand, two hundred seventy-three".