201121057 has 2 divisors, whose sum is σ = 201121058. Its totient is φ = 201121056.

The previous prime is 201121051. The next prime is 201121073. The reversal of 201121057 is 750121102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109746576 + 91374481 = 10476^2 + 9559^2 .

It is a cyclic number.

It is not a de Polignac number, because 201121057 - 2¹⁹ = 200596769 is a prime.

It is not a weakly prime, because it can be changed into another prime (201121051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100560528 + 100560529.

It is an arithmetic number, because the mean of its divisors is an integer number (100560529).

Almost surely, 2^201121057 is an apocalyptic number.

It is an amenable number.

201121057 is a deficient number, since it is larger than the sum of its proper divisors (1).

201121057 is an equidigital number, since it uses as much as digits as its factorization.

201121057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 201121057 is about 14181.7155873329. The cubic root of 201121057 is about 585.8941759308.

Adding to 201121057 its reverse (750121102), we get a palindrome (951242159).

The spelling of 201121057 in words is "two hundred one million, one hundred twenty-one thousand, fifty-seven".