21481117 has 8 divisors (see below), whose sum is σ = 24590912. Its totient is φ = 18381600.

The previous prime is 21481111. The next prime is 21481177. The reversal of 21481117 is 71118412.

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

It is a cyclic number.

It is not a de Polignac number, because 21481117 - 2¹¹ = 21479069 is a prime.

It is a super-2 number, since 2×21481117² = 922876775135378, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21481091 and 21481100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21481111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2617 + ... + 7057.

It is an arithmetic number, because the mean of its divisors is an integer number (3073864).

Almost surely, 2^21481117 is an apocalyptic number.

It is an amenable number.

21481117 is a deficient number, since it is larger than the sum of its proper divisors (3109795).

21481117 is an equidigital number, since it uses as much as digits as its factorization.

21481117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5139.

The product of its digits is 448, while the sum is 25.

The square root of 21481117 is about 4634.7725942057. The cubic root of 21481117 is about 277.9834582915.

Adding to 21481117 its reverse (71118412), we get a palindrome (92599529).

The spelling of 21481117 in words is "twenty-one million, four hundred eighty-one thousand, one hundred seventeen".