21799117 has 8 divisors (see below), whose sum is σ = 23573376. Its totient is φ = 20079552.

The previous prime is 21799111. The next prime is 21799123. The reversal of 21799117 is 71199712.

It is an interprime number because it is at equal distance from previous prime (21799111) and next prime (21799123).

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 21799117 - 2³ = 21799109 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21799111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12843 + ... + 14440.

It is an arithmetic number, because the mean of its divisors is an integer number (2946672).

Almost surely, 2^21799117 is an apocalyptic number.

It is an amenable number.

21799117 is a deficient number, since it is larger than the sum of its proper divisors (1774259).

21799117 is a wasteful number, since it uses less digits than its factorization.

21799117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27347.

The product of its digits is 7938, while the sum is 37.

The square root of 21799117 is about 4668.9524521031. The cubic root of 21799117 is about 279.3484723914.

The spelling of 21799117 in words is "twenty-one million, seven hundred ninety-nine thousand, one hundred seventeen".