2021121201 has 24 divisors (see below), whose sum is σ = 2991465792. Its totient is φ = 1212772000.

The previous prime is 2021121191. The next prime is 2021121209. The reversal of 2021121201 is 1021211202.

It is not a de Polignac number, because 2021121201 - 2¹⁰ = 2021120177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2021121209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9100 + ... + 64226.

It is an arithmetic number, because the mean of its divisors is an integer number (124644408).

Almost surely, 2^2021121201 is an apocalyptic number.

It is an amenable number.

2021121201 is a deficient number, since it is larger than the sum of its proper divisors (970344591).

2021121201 is a wasteful number, since it uses less digits than its factorization.

2021121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55253 (or 55242 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2021121201 is about 44956.8815755719. The cubic root of 2021121201 is about 1264.3407024432.

Adding to 2021121201 its reverse (1021211202), we get a palindrome (3042332403).

Subtracting from 2021121201 its reverse (1021211202), we obtain a palindrome (999909999).

The spelling of 2021121201 in words is "two billion, twenty-one million, one hundred twenty-one thousand, two hundred one".