201121001 has 2 divisors, whose sum is σ = 201121002. Its totient is φ = 201121000.

The previous prime is 201120989. The next prime is 201121013. The reversal of 201121001 is 100121102.

It is a balanced prime because it is at equal distance from previous prime (201120989) and next prime (201121013).

It can be written as a sum of positive squares in only one way, i.e., 153165376 + 47955625 = 12376^2 + 6925^2 .

It is a cyclic number.

It is not a de Polignac number, because 201121001 - 2¹⁸ = 200858857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201121001.

It is not a weakly prime, because it can be changed into another prime (201121021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100560500 + 100560501.

It is an arithmetic number, because the mean of its divisors is an integer number (100560501).

Almost surely, 2^201121001 is an apocalyptic number.

It is an amenable number.

201121001 is a deficient number, since it is larger than the sum of its proper divisors (1).

201121001 is an equidigital number, since it uses as much as digits as its factorization.

201121001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 201121001 is about 14181.7136129595. The cubic root of 201121001 is about 585.8941215522.

Adding to 201121001 its reverse (100121102), we get a palindrome (301242103).

The spelling of 201121001 in words is "two hundred one million, one hundred twenty-one thousand, one".