21196117 has 4 divisors (see below), whose sum is σ = 21242956. Its totient is φ = 21149280.

The previous prime is 21196103. The next prime is 21196159. The reversal of 21196117 is 71169112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16329681 + 4866436 = 4041^2 + 2206^2 .

It is a cyclic number.

It is not a de Polignac number, because 21196117 - 2⁷ = 21195989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21196177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22734 + ... + 23647.

It is an arithmetic number, because the mean of its divisors is an integer number (5310739).

Almost surely, 2^21196117 is an apocalyptic number.

It is an amenable number.

21196117 is a deficient number, since it is larger than the sum of its proper divisors (46839).

21196117 is an equidigital number, since it uses as much as digits as its factorization.

21196117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46838.

The product of its digits is 756, while the sum is 28.

The square root of 21196117 is about 4603.9240871239. The cubic root of 21196117 is about 276.7486022060.

The spelling of 21196117 in words is "twenty-one million, one hundred ninety-six thousand, one hundred seventeen".