2121021201 has 16 divisors (see below), whose sum is σ = 3224721024. Its totient is φ = 1228464384.

The previous prime is 2121021197. The next prime is 2121021223. The reversal of 2121021201 is 1021201212.

It is not a de Polignac number, because 2121021201 - 2² = 2121021197 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121021241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1598901 + ... + 1600226.

It is an arithmetic number, because the mean of its divisors is an integer number (201545064).

Almost surely, 2^2121021201 is an apocalyptic number.

It is an amenable number.

2121021201 is a deficient number, since it is larger than the sum of its proper divisors (1103699823).

2121021201 is a wasteful number, since it uses less digits than its factorization.

2121021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3199160.

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

The square root of 2121021201 is about 46054.5459319707. The cubic root of 2121021201 is about 1284.8378930188.

Adding to 2121021201 its reverse (1021201212), we get a palindrome (3142222413).

It can be divided in two parts, 212 and 1021201, that multiplied together give a palindrome (216494612).

The spelling of 2121021201 in words is "two billion, one hundred twenty-one million, twenty-one thousand, two hundred one".