21206201 has 8 divisors (see below), whose sum is σ = 22305024. Its totient is φ = 20133360.

The previous prime is 21206189. The next prime is 21206219. The reversal of 21206201 is 10260212.

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 21206201 - 2¹⁸ = 20944057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21206401) 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, 4811 + ... + 8096.

It is an arithmetic number, because the mean of its divisors is an integer number (2788128).

Almost surely, 2^21206201 is an apocalyptic number.

It is an amenable number.

21206201 is a deficient number, since it is larger than the sum of its proper divisors (1098823).

21206201 is a wasteful number, since it uses less digits than its factorization.

21206201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12991.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21206201 is about 4605.0191096238. The cubic root of 21206201 is about 276.7924827346.

Adding to 21206201 its reverse (10260212), we get a palindrome (31466413).

The spelling of 21206201 in words is "twenty-one million, two hundred six thousand, two hundred one".