21061117 has 8 divisors (see below), whose sum is σ = 26258112. Its totient is φ = 16411200.

The previous prime is 21061109. The next prime is 21061127. The reversal of 21061117 is 71116012.

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 21061117 - 2³ = 21061109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21061094 and 21061103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21061127) 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, 136684 + ... + 136837.

It is an arithmetic number, because the mean of its divisors is an integer number (3282264).

Almost surely, 2^21061117 is an apocalyptic number.

It is an amenable number.

21061117 is a deficient number, since it is larger than the sum of its proper divisors (5196995).

21061117 is a wasteful number, since it uses less digits than its factorization.

21061117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273539.

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 21061117 is about 4589.2392615770. The cubic root of 21061117 is about 276.1598047103.

Adding to 21061117 its reverse (71116012), we get a palindrome (92177129).

It can be divided in two parts, 2106 and 1117, that added together give a palindrome (3223).

The spelling of 21061117 in words is "twenty-one million, sixty-one thousand, one hundred seventeen".