20121121201 has 16 divisors (see below), whose sum is σ = 21451752000. Its totient is φ = 18818008128.

The previous prime is 20121121169. The next prime is 20121121213. The reversal of 20121121201 is 10212112102.

It is a cyclic number.

It is not a de Polignac number, because 20121121201 - 2⁵ = 20121121169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121121271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2438655 + ... + 2446891.

It is an arithmetic number, because the mean of its divisors is an integer number (1340734500).

Almost surely, 2^20121121201 is an apocalyptic number.

It is an amenable number.

20121121201 is a deficient number, since it is larger than the sum of its proper divisors (1330630799).

20121121201 is a wasteful number, since it uses less digits than its factorization.

20121121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9888.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20121121201 its reverse (10212112102), we get a palindrome (30333233303).

Subtracting from 20121121201 its reverse (10212112102), we obtain a palindrome (9909009099).

The spelling of 20121121201 in words is "twenty billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred one".