21723580810 has 8 divisors (see below), whose sum is σ = 39102445476. Its totient is φ = 8689432320.

The previous prime is 21723580789. The next prime is 21723580811. The reversal of 21723580810 is 1808532712.

It can be written as a sum of positive squares in 2 ways, for example, as 19783266409 + 1940314401 = 140653^2 + 44049^2 .

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

It is a super-2 number, since 2×21723580810² (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 21723580810.

It is not an unprimeable number, because it can be changed into a prime (21723580811) 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, 1086179031 + ... + 1086179050.

Almost surely, 2^21723580810 is an apocalyptic number.

21723580810 is a deficient number, since it is larger than the sum of its proper divisors (17378864666).

21723580810 is a wasteful number, since it uses less digits than its factorization.

21723580810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2172358088.

The product of its (nonzero) digits is 26880, while the sum is 37.

The spelling of 21723580810 in words is "twenty-one billion, seven hundred twenty-three million, five hundred eighty thousand, eight hundred ten".