211123001 has 2 divisors, whose sum is σ = 211123002. Its totient is φ = 211123000.

The previous prime is 211122971. The next prime is 211123021. The reversal of 211123001 is 100321112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178917376 + 32205625 = 13376^2 + 5675^2 .

It is a cyclic number.

It is not a de Polignac number, because 211123001 - 2¹⁴ = 211106617 is a prime.

It is not a weakly prime, because it can be changed into another prime (211123021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105561500 + 105561501.

It is an arithmetic number, because the mean of its divisors is an integer number (105561501).

Almost surely, 2^211123001 is an apocalyptic number.

It is an amenable number.

211123001 is a deficient number, since it is larger than the sum of its proper divisors (1).

211123001 is an equidigital number, since it uses as much as digits as its factorization.

211123001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 211123001 is about 14530.0722985125. The cubic root of 211123001 is about 595.4498408325.

Adding to 211123001 its reverse (100321112), we get a palindrome (311444113).

The spelling of 211123001 in words is "two hundred eleven million, one hundred twenty-three thousand, one".