21160207 has 8 divisors (see below), whose sum is σ = 22301280. Its totient is φ = 20037600.

The previous prime is 21160177. The next prime is 21160211. The reversal of 21160207 is 70206112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21160207 - 2⁷ = 21160079 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 (21100207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2232 + ... + 6877.

It is an arithmetic number, because the mean of its divisors is an integer number (2787660).

Almost surely, 2^21160207 is an apocalyptic number.

21160207 is a deficient number, since it is larger than the sum of its proper divisors (1141073).

21160207 is a wasteful number, since it uses less digits than its factorization.

21160207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9233.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 21160207 is about 4600.0224999450. The cubic root of 21160207 is about 276.5922267109.

Adding to 21160207 its reverse (70206112), we get a palindrome (91366319).

The spelling of 21160207 in words is "twenty-one million, one hundred sixty thousand, two hundred seven".