211223310031 has 4 divisors (see below), whose sum is σ = 213768169272. Its totient is φ = 208678450792.

The previous prime is 211223310029. The next prime is 211223310049. The reversal of 211223310031 is 130013322112.

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 211223310031 - 2¹ = 211223310029 is a prime.

It is a super-2 number, since 2×211223310031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211223309990 and 211223310008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211223311031) 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, 1272429496 + ... + 1272429661.

It is an arithmetic number, because the mean of its divisors is an integer number (53442042318).

Almost surely, 2^211223310031 is an apocalyptic number.

211223310031 is a deficient number, since it is larger than the sum of its proper divisors (2544859241).

211223310031 is an equidigital number, since it uses as much as digits as its factorization.

211223310031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2544859240.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 211223310031 its reverse (130013322112), we get a palindrome (341236632143).

The spelling of 211223310031 in words is "two hundred eleven billion, two hundred twenty-three million, three hundred ten thousand, thirty-one".