20111201 has 4 divisors (see below), whose sum is σ = 21939504. Its totient is φ = 18282900.

The previous prime is 20111183. The next prime is 20111213. The reversal of 20111201 is 10211102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20111201 - 2⁶ = 20111137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111261) 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, 914135 + ... + 914156.

It is an arithmetic number, because the mean of its divisors is an integer number (5484876).

Almost surely, 2^20111201 is an apocalyptic number.

It is an amenable number.

20111201 is a deficient number, since it is larger than the sum of its proper divisors (1828303).

20111201 is a wasteful number, since it uses less digits than its factorization.

20111201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828302.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 20111201 is about 4484.5513710961. The cubic root of 20111201 is about 271.9439087409.

Adding to 20111201 its reverse (10211102), we get a palindrome (30322303).

Subtracting from 20111201 its reverse (10211102), we obtain a palindrome (9900099).

The spelling of 20111201 in words is "twenty million, one hundred eleven thousand, two hundred one".