21170240810 has 8 divisors (see below), whose sum is σ = 38106433476. Its totient is φ = 8468096320.

The previous prime is 21170240807. The next prime is 21170240813. The reversal of 21170240810 is 1804207112.

It is an interprime number because it is at equal distance from previous prime (21170240807) and next prime (21170240813).

It can be written as a sum of positive squares in 2 ways, for example, as 20819315521 + 350925289 = 144289^2 + 18733^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21170240810² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21170240810.

It is not an unprimeable number, because it can be changed into a prime (21170240813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1058512031 + ... + 1058512050.

Almost surely, 2^21170240810 is an apocalyptic number.

21170240810 is a deficient number, since it is larger than the sum of its proper divisors (16936192666).

21170240810 is a wasteful number, since it uses less digits than its factorization.

21170240810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2117024088.

The product of its (nonzero) digits is 896, while the sum is 26.

Adding to 21170240810 its reverse (1804207112), we get a palindrome (22974447922).

The spelling of 21170240810 in words is "twenty-one billion, one hundred seventy million, two hundred forty thousand, eight hundred ten".