21110171701 has 4 divisors (see below), whose sum is σ = 21319183404. Its totient is φ = 20901160000.

The previous prime is 21110171699. The next prime is 21110171707. The reversal of 21110171701 is 10717101112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20014892676 + 1095279025 = 141474^2 + 33095^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110171701 - 2¹ = 21110171699 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110171707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104505700 + ... + 104505901.

It is an arithmetic number, because the mean of its divisors is an integer number (5329795851).

Almost surely, 2^21110171701 is an apocalyptic number.

It is an amenable number.

21110171701 is a deficient number, since it is larger than the sum of its proper divisors (209011703).

21110171701 is a wasteful number, since it uses less digits than its factorization.

21110171701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209011702.

The product of its (nonzero) digits is 98, while the sum is 22.

Adding to 21110171701 its reverse (10717101112), we get a palindrome (31827272813).

The spelling of 21110171701 in words is "twenty-one billion, one hundred ten million, one hundred seventy-one thousand, seven hundred one".