21204201 has 8 divisors (see below), whose sum is σ = 28322784. Its totient is φ = 14110880.

The previous prime is 21204199. The next prime is 21204223. The reversal of 21204201 is 10240212.

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 21204201 - 2¹ = 21204199 is a prime.

It is a super-3 number, since 3×21204201³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21204241) 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, 4260 + ... + 7781.

It is an arithmetic number, because the mean of its divisors is an integer number (3540348).

Almost surely, 2^21204201 is an apocalyptic number.

It is an amenable number.

21204201 is a deficient number, since it is larger than the sum of its proper divisors (7118583).

21204201 is a wasteful number, since it uses less digits than its factorization.

21204201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12631.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 21204201 is about 4604.8019501386. The cubic root of 21204201 is about 276.7837808402.

Adding to 21204201 its reverse (10240212), we get a palindrome (31444413).

The spelling of 21204201 in words is "twenty-one million, two hundred four thousand, two hundred one".