21100803833 has 2 divisors, whose sum is σ = 21100803834. Its totient is φ = 21100803832.

The previous prime is 21100803809. The next prime is 21100803839. The reversal of 21100803833 is 33830800112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20526865984 + 573937849 = 143272^2 + 23957^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100803833 - 2¹⁶ = 21100738297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21100803796 and 21100803805.

It is not a weakly prime, because it can be changed into another prime (21100803839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550401916 + 10550401917.

It is an arithmetic number, because the mean of its divisors is an integer number (10550401917).

Almost surely, 2^21100803833 is an apocalyptic number.

It is an amenable number.

21100803833 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100803833 is an equidigital number, since it uses as much as digits as its factorization.

21100803833 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The spelling of 21100803833 in words is "twenty-one billion, one hundred million, eight hundred three thousand, eight hundred thirty-three".