21083123321811 has 12 divisors (see below), whose sum is σ = 32056210898920. Its totient is φ = 13315656834720.

The previous prime is 21083123321779. The next prime is 21083123321851. The reversal of 21083123321811 is 11812332138012.

21083123321811 is a `hidden beast` number, since 2 + 1 + 0 + 8 + 312 + 3 + 321 + 8 + 11 = 666.

It is not a de Polignac number, because 21083123321811 - 2⁵ = 21083123321779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21083123321851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61646559250 + ... + 61646559591.

Almost surely, 2^{21083123321811} is an apocalyptic number.

21083123321811 is a deficient number, since it is larger than the sum of its proper divisors (10973087577109).

21083123321811 is a wasteful number, since it uses less digits than its factorization.

21083123321811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123293118866 (or 123293118863 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

Adding to 21083123321811 its reverse (11812332138012), we get a palindrome (32895455459823).

The spelling of 21083123321811 in words is "twenty-one trillion, eighty-three billion, one hundred twenty-three million, three hundred twenty-one thousand, eight hundred eleven".