211100123231 has 4 divisors (see below), whose sum is σ = 211292558352. Its totient is φ = 210907688112.

The previous prime is 211100123209. The next prime is 211100123239. The reversal of 211100123231 is 132321001112.

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 211100123231 - 2⁶ = 211100123167 is a prime.

It is a super-2 number, since 2×211100123231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211100123239) 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, 96215915 + ... + 96218108.

It is an arithmetic number, because the mean of its divisors is an integer number (52823139588).

Almost surely, 2^211100123231 is an apocalyptic number.

211100123231 is a deficient number, since it is larger than the sum of its proper divisors (192435121).

211100123231 is a wasteful number, since it uses less digits than its factorization.

211100123231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192435120.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 211100123231 its reverse (132321001112), we get a palindrome (343421124343).

The spelling of 211100123231 in words is "two hundred eleven billion, one hundred million, one hundred twenty-three thousand, two hundred thirty-one".