21117363 has 4 divisors (see below), whose sum is σ = 28156488. Its totient is φ = 14078240.

The previous prime is 21117359. The next prime is 21117377. The reversal of 21117363 is 36371112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21117363 - 2² = 21117359 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21117353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3519558 + ... + 3519563.

It is an arithmetic number, because the mean of its divisors is an integer number (7039122).

Almost surely, 2^21117363 is an apocalyptic number.

21117363 is a deficient number, since it is larger than the sum of its proper divisors (7039125).

21117363 is an equidigital number, since it uses as much as digits as its factorization.

21117363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7039124.

The product of its digits is 756, while the sum is 24.

The square root of 21117363 is about 4595.3632065377. The cubic root of 21117363 is about 276.4054244375.

Adding to 21117363 its reverse (36371112), we get a palindrome (57488475).

The spelling of 21117363 in words is "twenty-one million, one hundred seventeen thousand, three hundred sixty-three".