21272945833 has 2 divisors, whose sum is σ = 21272945834. Its totient is φ = 21272945832.

The previous prime is 21272945831. The next prime is 21272945879. The reversal of 21272945833 is 33854927212.

It is an a-pointer prime, because the next prime (21272945879) can be obtained adding 21272945833 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12376117504 + 8896828329 = 111248^2 + 94323^2 .

It is a cyclic number.

It is not a de Polignac number, because 21272945833 - 2¹ = 21272945831 is a prime.

Together with 21272945831, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21272945831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10636472916 + 10636472917.

It is an arithmetic number, because the mean of its divisors is an integer number (10636472917).

Almost surely, 2^21272945833 is an apocalyptic number.

It is an amenable number.

21272945833 is a deficient number, since it is larger than the sum of its proper divisors (1).

21272945833 is an equidigital number, since it uses as much as digits as its factorization.

21272945833 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 46.

The spelling of 21272945833 in words is "twenty-one billion, two hundred seventy-two million, nine hundred forty-five thousand, eight hundred thirty-three".