21040206111 has 40 divisors (see below), whose sum is σ = 35030864880. Its totient is φ = 12506856192.

The previous prime is 21040206049. The next prime is 21040206151. The reversal of 21040206111 is 11160204012.

21040206111 is a `hidden beast` number, since 2 + 10 + 40 + 2 + 0 + 611 + 1 = 666.

It is not a de Polignac number, because 21040206111 - 2¹⁴ = 21040189727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21040206151) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 375936 + ... + 428261.

It is an arithmetic number, because the mean of its divisors is an integer number (875771622).

Almost surely, 2^21040206111 is an apocalyptic number.

21040206111 is a deficient number, since it is larger than the sum of its proper divisors (13990658769).

21040206111 is a wasteful number, since it uses less digits than its factorization.

21040206111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804245 (or 804236 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The spelling of 21040206111 in words is "twenty-one billion, forty million, two hundred six thousand, one hundred eleven".