213201311123 has 4 divisors (see below), whose sum is σ = 217737509280. Its totient is φ = 208665112968.

The previous prime is 213201311039. The next prime is 213201311131. The reversal of 213201311123 is 321113102312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213201311123 is a prime.

It is a super-2 number, since 2×213201311123² (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 = 213201311095 and 213201311104.

It is not an unprimeable number, because it can be changed into a prime (213201311423) 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, 2268099008 + ... + 2268099101.

It is an arithmetic number, because the mean of its divisors is an integer number (54434377320).

Almost surely, 2^213201311123 is an apocalyptic number.

213201311123 is a deficient number, since it is larger than the sum of its proper divisors (4536198157).

213201311123 is an equidigital number, since it uses as much as digits as its factorization.

213201311123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4536198156.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 213201311123 its reverse (321113102312), we get a palindrome (534314413435).

The spelling of 213201311123 in words is "two hundred thirteen billion, two hundred one million, three hundred eleven thousand, one hundred twenty-three".