2121220201 has 4 divisors (see below), whose sum is σ = 2152880272. Its totient is φ = 2089560132.

The previous prime is 2121220151. The next prime is 2121220207. The reversal of 2121220201 is 1020221212.

It is a happy number.

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 2121220201 - 2¹⁵ = 2121187433 is a prime.

It is a super-2 number, since 2×2121220201² = 8999150282260960802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121220207) 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 3 ways as a sum of consecutive naturals, for example, 15829935 + ... + 15830068.

It is an arithmetic number, because the mean of its divisors is an integer number (538220068).

Almost surely, 2^2121220201 is an apocalyptic number.

It is an amenable number.

2121220201 is a deficient number, since it is larger than the sum of its proper divisors (31660071).

2121220201 is an equidigital number, since it uses as much as digits as its factorization.

2121220201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31660070.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2121220201 is about 46056.7063629174. The cubic root of 2121220201 is about 1284.8780740952.

Adding to 2121220201 its reverse (1020221212), we get a palindrome (3141441413).

The spelling of 2121220201 in words is "two billion, one hundred twenty-one million, two hundred twenty thousand, two hundred one".