21040115726 has 32 divisors (see below), whose sum is σ = 36643100160. Its totient is φ = 8873875296.

The previous prime is 21040115717. The next prime is 21040115737. The reversal of 21040115726 is 62751104012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 992231 + ... + 1013213.

It is an arithmetic number, because the mean of its divisors is an integer number (1145096880).

Almost surely, 2^21040115726 is an apocalyptic number.

21040115726 is a deficient number, since it is larger than the sum of its proper divisors (15602984434).

21040115726 is a wasteful number, since it uses less digits than its factorization.

21040115726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22128.

The product of its (nonzero) digits is 3360, while the sum is 29.

Adding to 21040115726 its reverse (62751104012), we get a palindrome (83791219738).

The spelling of 21040115726 in words is "twenty-one billion, forty million, one hundred fifteen thousand, seven hundred twenty-six".