213103123231 has 16 divisors (see below), whose sum is σ = 216696176640. Its totient is φ = 209534307840.

The previous prime is 213103123223. The next prime is 213103123279. The reversal of 213103123231 is 132321301312.

It is a cyclic number.

It is not a de Polignac number, because 213103123231 - 2³ = 213103123223 is a prime.

It is a super-2 number, since 2×213103123231² (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 (213103123201) 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, 19640850 + ... + 19651696.

It is an arithmetic number, because the mean of its divisors is an integer number (13543511040).

Almost surely, 2^213103123231 is an apocalyptic number.

213103123231 is a deficient number, since it is larger than the sum of its proper divisors (3593053409).

213103123231 is a wasteful number, since it uses less digits than its factorization.

213103123231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11934.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 213103123231 its reverse (132321301312), we get a palindrome (345424424543).

The spelling of 213103123231 in words is "two hundred thirteen billion, one hundred three million, one hundred twenty-three thousand, two hundred thirty-one".