213111123123 has 8 divisors (see below), whose sum is σ = 300862762128. Its totient is φ = 133716783104.

The previous prime is 213111123107. The next prime is 213111123131. The reversal of 213111123123 is 321321111312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213111123123 - 2⁴ = 213111123107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213111123123.

It is not an unprimeable number, because it can be changed into a prime (213111123103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2089324686 + ... + 2089324787.

It is an arithmetic number, because the mean of its divisors is an integer number (37607845266).

Almost surely, 2^213111123123 is an apocalyptic number.

213111123123 is a deficient number, since it is larger than the sum of its proper divisors (87751639005).

213111123123 is a wasteful number, since it uses less digits than its factorization.

213111123123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4178649493.

The product of its digits is 216, while the sum is 21.

Adding to 213111123123 its reverse (321321111312), we get a palindrome (534432234435).

The spelling of 213111123123 in words is "two hundred thirteen billion, one hundred eleven million, one hundred twenty-three thousand, one hundred twenty-three".