2201000121 has 20 divisors (see below), whose sum is σ = 3290218932. Its totient is φ = 1466304768.

The previous prime is 2201000117. The next prime is 2201000159. The reversal of 2201000121 is 1210001022.

It can be written as a sum of positive squares in 2 ways, for example, as 77633721 + 2123366400 = 8811^2 + 46080^2 .

It is not a de Polignac number, because 2201000121 - 2² = 2201000117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2201004121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 117045 + ... + 134541.

Almost surely, 2^2201000121 is an apocalyptic number.

It is an amenable number.

2201000121 is a deficient number, since it is larger than the sum of its proper divisors (1089218811).

2201000121 is a wasteful number, since it uses less digits than its factorization.

2201000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19062 (or 19053 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 2201000121 is about 46914.8177125309. The cubic root of 2201000121 is about 1300.7885001485.

Adding to 2201000121 its reverse (1210001022), we get a palindrome (3411001143).

Subtracting from 2201000121 its reverse (1210001022), we obtain a palindrome (990999099).

The spelling of 2201000121 in words is "two billion, two hundred one million, one hundred twenty-one", and thus it is an aban number.