211243023 has 6 divisors (see below), whose sum is σ = 305128824. Its totient is φ = 140828676.

The previous prime is 211242979. The next prime is 211243031. The reversal of 211243023 is 320342112.

211243023 is a `hidden beast` number, since 211 + 2 + 430 + 23 = 666.

It is not a de Polignac number, because 211243023 - 2⁸ = 211242767 is a prime.

It is a super-2 number, since 2×211243023² = 89247229532357058, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211242987 and 211243005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211263023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11735715 + ... + 11735732.

It is an arithmetic number, because the mean of its divisors is an integer number (50854804).

Almost surely, 2^211243023 is an apocalyptic number.

211243023 is a deficient number, since it is larger than the sum of its proper divisors (93885801).

211243023 is a wasteful number, since it uses less digits than its factorization.

211243023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23471453 (or 23471450 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 211243023 is about 14534.2018356702. The cubic root of 211243023 is about 595.5626558611.

Adding to 211243023 its reverse (320342112), we get a palindrome (531585135).

The spelling of 211243023 in words is "two hundred eleven million, two hundred forty-three thousand, twenty-three".