21201107 has 4 divisors (see below), whose sum is σ = 21694200. Its totient is φ = 20708016.

The previous prime is 21201083. The next prime is 21201109. The reversal of 21201107 is 70110212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21201107 - 2¹⁰ = 21200083 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21201091 and 21201100.

It is not an unprimeable number, because it can be changed into a prime (21201109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246482 + ... + 246567.

It is an arithmetic number, because the mean of its divisors is an integer number (5423550).

Almost surely, 2^21201107 is an apocalyptic number.

21201107 is a deficient number, since it is larger than the sum of its proper divisors (493093).

21201107 is an equidigital number, since it uses as much as digits as its factorization.

21201107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493092.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 21201107 is about 4604.4659842375. The cubic root of 21201107 is about 276.7703179314.

Adding to 21201107 its reverse (70110212), we get a palindrome (91311319).

The spelling of 21201107 in words is "twenty-one million, two hundred one thousand, one hundred seven".