2200212121 has 4 divisors (see below), whose sum is σ = 2201352292. Its totient is φ = 2199071952.

The previous prime is 2200212109. The next prime is 2200212127. The reversal of 2200212121 is 1212120022.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1212120022 = 2 ⋅606060011.

It can be written as a sum of positive squares in 2 ways, for example, as 613305225 + 1586906896 = 24765^2 + 39836^2 .

It is a cyclic number.

It is not a de Polignac number, because 2200212121 - 2¹¹ = 2200210073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2200212127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 567186 + ... + 571051.

It is an arithmetic number, because the mean of its divisors is an integer number (550338073).

Almost surely, 2^2200212121 is an apocalyptic number.

It is an amenable number.

2200212121 is a deficient number, since it is larger than the sum of its proper divisors (1140171).

2200212121 is a wasteful number, since it uses less digits than its factorization.

2200212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140170.

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

The square root of 2200212121 is about 46906.4187611888. The cubic root of 2200212121 is about 1300.6332459259.

Adding to 2200212121 its reverse (1212120022), we get a palindrome (3412332143).

The spelling of 2200212121 in words is "two billion, two hundred million, two hundred twelve thousand, one hundred twenty-one".