21634201 has 8 divisors (see below), whose sum is σ = 21964544. Its totient is φ = 21306240.

The previous prime is 21634181. The next prime is 21634213. The reversal of 21634201 is 10243612.

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 21634201 - 2⁷ = 21634073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21634271) 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, 25876 + ... + 26698.

It is an arithmetic number, because the mean of its divisors is an integer number (2745568).

Almost surely, 2^21634201 is an apocalyptic number.

It is an amenable number.

21634201 is a deficient number, since it is larger than the sum of its proper divisors (330343).

21634201 is an equidigital number, since it uses as much as digits as its factorization.

21634201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1191.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21634201 is about 4651.2580018743. The cubic root of 21634201 is about 278.6422404499.

Adding to 21634201 its reverse (10243612), we get a palindrome (31877813).

It can be divided in two parts, 21634 and 201, that multiplied together give a palindrome (4348434).

The spelling of 21634201 in words is "twenty-one million, six hundred thirty-four thousand, two hundred one".