2201121521 has 2 divisors, whose sum is σ = 2201121522. Its totient is φ = 2201121520.

The previous prime is 2201121509. The next prime is 2201121523. The reversal of 2201121521 is 1251211022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1943839921 + 257281600 = 44089^2 + 16040^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2201121521 is a prime.

Together with 2201121523, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2201121521.

It is not a weakly prime, because it can be changed into another prime (2201121523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1100560760 + 1100560761.

It is an arithmetic number, because the mean of its divisors is an integer number (1100560761).

Almost surely, 2^2201121521 is an apocalyptic number.

It is an amenable number.

2201121521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2201121521 is an equidigital number, since it uses as much as digits as its factorization.

2201121521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 2201121521 is about 46916.1115289833. Note that the first 3 decimals coincide. The cubic root of 2201121521 is about 1300.8124154616.

Adding to 2201121521 its reverse (1251211022), we get a palindrome (3452332543).

The spelling of 2201121521 in words is "two billion, two hundred one million, one hundred twenty-one thousand, five hundred twenty-one".