21801111706 has 32 divisors (see below), whose sum is σ = 37237366656. Its totient is φ = 9475752000.

The previous prime is 21801111701. The next prime is 21801111707. The reversal of 21801111706 is 60711110812.

It is not an unprimeable number, because it can be changed into a prime (21801111701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2536336 + ... + 2544916.

It is an arithmetic number, because the mean of its divisors is an integer number (1163667708).

Almost surely, 2^21801111706 is an apocalyptic number.

21801111706 is a deficient number, since it is larger than the sum of its proper divisors (15436254950).

21801111706 is a wasteful number, since it uses less digits than its factorization.

21801111706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13638.

The product of its (nonzero) digits is 672, while the sum is 28.

The spelling of 21801111706 in words is "twenty-one billion, eight hundred one million, one hundred eleven thousand, seven hundred six".