21760117 has 4 divisors (see below), whose sum is σ = 21857920. Its totient is φ = 21662316.

The previous prime is 21760099. The next prime is 21760127. The reversal of 21760117 is 71106712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21760117 - 2¹⁹ = 21235829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21760091 and 21760100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21760127) 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, 48567 + ... + 49012.

It is an arithmetic number, because the mean of its divisors is an integer number (5464480).

Almost surely, 2^21760117 is an apocalyptic number.

It is an amenable number.

21760117 is a deficient number, since it is larger than the sum of its proper divisors (97803).

21760117 is an equidigital number, since it uses as much as digits as its factorization.

21760117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97802.

The product of its (nonzero) digits is 588, while the sum is 25.

The square root of 21760117 is about 4664.7740566934. The cubic root of 21760117 is about 279.1817822463.

Adding to 21760117 its reverse (71106712), we get a palindrome (92866829).

The spelling of 21760117 in words is "twenty-one million, seven hundred sixty thousand, one hundred seventeen".