212103111231 has 24 divisors (see below), whose sum is σ = 335429709264. Its totient is φ = 128083253760.

The previous prime is 212103111229. The next prime is 212103111271. The reversal of 212103111231 is 132111301212.

212103111231 is a `hidden beast` number, since 2 + 121 + 0 + 311 + 1 + 231 = 666.

It is not a de Polignac number, because 212103111231 - 2¹ = 212103111229 is a prime.

It is a super-2 number, since 2×212103111231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212103111271) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3839826 + ... + 3894671.

It is an arithmetic number, because the mean of its divisors is an integer number (13976237886).

Almost surely, 2^212103111231 is an apocalyptic number.

212103111231 is a deficient number, since it is larger than the sum of its proper divisors (123326598033).

212103111231 is a wasteful number, since it uses less digits than its factorization.

212103111231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7734791 (or 7734788 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 212103111231 its reverse (132111301212), we get a palindrome (344214412443).

The spelling of 212103111231 in words is "two hundred twelve billion, one hundred three million, one hundred eleven thousand, two hundred thirty-one".