21186201 has 8 divisors (see below), whose sum is σ = 28269664. Its totient is φ = 14113440.

The previous prime is 21186181. The next prime is 21186203. The reversal of 21186201 is 10268112.

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

It is not a de Polignac number, because 21186201 - 2⁵ = 21186169 is a prime.

It is a super-2 number, since 2×21186201² = 897710225624802, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21186203) 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, 5646 + ... + 8616.

It is an arithmetic number, because the mean of its divisors is an integer number (3533708).

Almost surely, 2^21186201 is an apocalyptic number.

It is an amenable number.

21186201 is a deficient number, since it is larger than the sum of its proper divisors (7083463).

21186201 is a wasteful number, since it uses less digits than its factorization.

21186201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5351.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 21186201 is about 4602.8470537266. The cubic root of 21186201 is about 276.7054391557.

The spelling of 21186201 in words is "twenty-one million, one hundred eighty-six thousand, two hundred one".