211423023011 has 4 divisors (see below), whose sum is σ = 211464426792. Its totient is φ = 211381619232.

The previous prime is 211423022999. The next prime is 211423023029. The reversal of 211423023011 is 110320324112.

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 211423023011 - 2²² = 211418828707 is a prime.

It is a super-2 number, since 2×211423023011² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211423053011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20694230 + ... + 20704443.

It is an arithmetic number, because the mean of its divisors is an integer number (52866106698).

Almost surely, 2^211423023011 is an apocalyptic number.

211423023011 is a deficient number, since it is larger than the sum of its proper divisors (41403781).

211423023011 is an equidigital number, since it uses as much as digits as its factorization.

211423023011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41403780.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 211423023011 its reverse (110320324112), we get a palindrome (321743347123).

The spelling of 211423023011 in words is "two hundred eleven billion, four hundred twenty-three million, twenty-three thousand, eleven".