21040201 has 32 divisors (see below), whose sum is σ = 27991040. Its totient is φ = 15349824.

The previous prime is 21040199. The next prime is 21040213. The reversal of 21040201 is 10204012.

It is not a de Polignac number, because 21040201 - 2¹ = 21040199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21040231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74206 + ... + 74488.

It is an arithmetic number, because the mean of its divisors is an integer number (874720).

Almost surely, 2^21040201 is an apocalyptic number.

It is an amenable number.

21040201 is a deficient number, since it is larger than the sum of its proper divisors (6950839).

21040201 is a wasteful number, since it uses less digits than its factorization.

21040201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 21040201 is about 4586.9598864607. The cubic root of 21040201 is about 276.0683554351.

Adding to 21040201 its reverse (10204012), we get a palindrome (31244213).

The spelling of 21040201 in words is "twenty-one million, forty thousand, two hundred one".