20121201 has 24 divisors (see below), whose sum is σ = 30750720. Its totient is φ = 12657600.

The previous prime is 20121193. The next prime is 20121271. The reversal of 20121201 is 10212102.

It is not a de Polignac number, because 20121201 - 2³ = 20121193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121271) 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 23 ways as a sum of consecutive naturals, for example, 10560 + ... + 12318.

It is an arithmetic number, because the mean of its divisors is an integer number (1281280).

Almost surely, 2^20121201 is an apocalyptic number.

It is an amenable number.

20121201 is a deficient number, since it is larger than the sum of its proper divisors (10629519).

20121201 is a wasteful number, since it uses less digits than its factorization.

20121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1837 (or 1834 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 20121201 is about 4485.6661712615. Note that the first 3 decimals coincide. The cubic root of 20121201 is about 271.9889746468.

Adding to 20121201 its reverse (10212102), we get a palindrome (30333303).

Subtracting from 20121201 its reverse (10212102), we obtain a palindrome (9909099).

The spelling of 20121201 in words is "twenty million, one hundred twenty-one thousand, two hundred one".