201212231123 has 16 divisors (see below), whose sum is σ = 211661724672. Its totient is φ = 191011548000.

The previous prime is 201212231117. The next prime is 201212231161. The reversal of 201212231123 is 321132212102.

It is a cyclic number.

It is not a de Polignac number, because 201212231123 - 2¹⁶ = 201212165587 is a prime.

It is a super-2 number, since 2×201212231123² (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 = 201212231095 and 201212231104.

It is not an unprimeable number, because it can be changed into a prime (201212231173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13614728 + ... + 13629498.

It is an arithmetic number, because the mean of its divisors is an integer number (13228857792).

Almost surely, 2^201212231123 is an apocalyptic number.

201212231123 is a deficient number, since it is larger than the sum of its proper divisors (10449493549).

201212231123 is a wasteful number, since it uses less digits than its factorization.

201212231123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23146.

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

Adding to 201212231123 its reverse (321132212102), we get a palindrome (522344443225).

The spelling of 201212231123 in words is "two hundred one billion, two hundred twelve million, two hundred thirty-one thousand, one hundred twenty-three".