2122201021 has 4 divisors (see below), whose sum is σ = 2147769792. Its totient is φ = 2096632252.

The previous prime is 2122201019. The next prime is 2122201027. The reversal of 2122201021 is 1201022212.

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 2122201021 - 2¹ = 2122201019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2122200992 and 2122201010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122201027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12784261 + ... + 12784426.

It is an arithmetic number, because the mean of its divisors is an integer number (536942448).

Almost surely, 2^2122201021 is an apocalyptic number.

It is an amenable number.

2122201021 is a deficient number, since it is larger than the sum of its proper divisors (25568771).

2122201021 is an equidigital number, since it uses as much as digits as its factorization.

2122201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25568770.

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

The square root of 2122201021 is about 46067.3530930528. The cubic root of 2122201021 is about 1285.0760796149.

Adding to 2122201021 its reverse (1201022212), we get a palindrome (3323223233).

The spelling of 2122201021 in words is "two billion, one hundred twenty-two million, two hundred one thousand, twenty-one".