21496409833 has 2 divisors, whose sum is σ = 21496409834. Its totient is φ = 21496409832.

The previous prime is 21496409827. The next prime is 21496409863. The reversal of 21496409833 is 33890469412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21024130009 + 472279824 = 144997^2 + 21732^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21496409833 is a prime.

It is not a weakly prime, because it can be changed into another prime (21496409863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10748204916 + 10748204917.

It is an arithmetic number, because the mean of its divisors is an integer number (10748204917).

Almost surely, 2^21496409833 is an apocalyptic number.

It is an amenable number.

21496409833 is a deficient number, since it is larger than the sum of its proper divisors (1).

21496409833 is an equidigital number, since it uses as much as digits as its factorization.

21496409833 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 49.

The spelling of 21496409833 in words is "twenty-one billion, four hundred ninety-six million, four hundred nine thousand, eight hundred thirty-three".