21036117 has 8 divisors (see below), whose sum is σ = 28070496. Its totient is φ = 14012912.

The previous prime is 21036083. The next prime is 21036131. The reversal of 21036117 is 71163012.

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 21036117 - 2¹⁵ = 21003349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21036093 and 21036102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21036137) 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, 3883 + ... + 7559.

It is an arithmetic number, because the mean of its divisors is an integer number (3508812).

Almost surely, 2^21036117 is an apocalyptic number.

It is an amenable number.

21036117 is a deficient number, since it is larger than the sum of its proper divisors (7034379).

21036117 is a wasteful number, since it uses less digits than its factorization.

21036117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5587.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 21036117 is about 4586.5146898271. The cubic root of 21036117 is about 276.0504922325.

Adding to 21036117 its reverse (71163012), we get a palindrome (92199129).

The spelling of 21036117 in words is "twenty-one million, thirty-six thousand, one hundred seventeen".