21035117 has 8 divisors (see below), whose sum is σ = 21595896. Its totient is φ = 20480512.

The previous prime is 21035111. The next prime is 21035123. The reversal of 21035117 is 71153012.

It is an interprime number because it is at equal distance from previous prime (21035111) and next prime (21035123).

It can be written as a sum of positive squares in 4 ways, for example, as 2208196 + 18826921 = 1486^2 + 4339^2 .

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 21035117 - 2⁸ = 21034861 is a prime.

It is a super-2 number, since 2×21035117² = 884952294407378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035111) 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, 5813 + ... + 8709.

It is an arithmetic number, because the mean of its divisors is an integer number (2699487).

Almost surely, 2^21035117 is an apocalyptic number.

It is an amenable number.

21035117 is a deficient number, since it is larger than the sum of its proper divisors (560779).

21035117 is a wasteful number, since it uses less digits than its factorization.

21035117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3087.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 21035117 is about 4586.4056732915. The cubic root of 21035117 is about 276.0461179324.

Adding to 21035117 its reverse (71153012), we get a palindrome (92188129).

The spelling of 21035117 in words is "twenty-one million, thirty-five thousand, one hundred seventeen".