211123023 has 4 divisors (see below), whose sum is σ = 281497368. Its totient is φ = 140748680.

The previous prime is 211123021. The next prime is 211123037. The reversal of 211123023 is 320321112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 211123023 - 2¹ = 211123021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211122993 and 211123011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211123021) 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 in 3 ways as a sum of consecutive naturals, for example, 35187168 + ... + 35187173.

It is an arithmetic number, because the mean of its divisors is an integer number (70374342).

Almost surely, 2^211123023 is an apocalyptic number.

211123023 is a deficient number, since it is larger than the sum of its proper divisors (70374345).

211123023 is an equidigital number, since it uses as much as digits as its factorization.

211123023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70374344.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 211123023 is about 14530.0730555631. The cubic root of 211123023 is about 595.4498615153.

Adding to 211123023 its reverse (320321112), we get a palindrome (531444135).

The spelling of 211123023 in words is "two hundred eleven million, one hundred twenty-three thousand, twenty-three".