213111123839 has 2 divisors, whose sum is σ = 213111123840. Its totient is φ = 213111123838.

The previous prime is 213111123833. The next prime is 213111123887. The reversal of 213111123839 is 938321111312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213111123839 is a prime.

It is a super-4 number, since 4×213111123839⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 213111123799 and 213111123808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213111123833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106555561919 + 106555561920.

It is an arithmetic number, because the mean of its divisors is an integer number (106555561920).

Almost surely, 2^213111123839 is an apocalyptic number.

213111123839 is a deficient number, since it is larger than the sum of its proper divisors (1).

213111123839 is an equidigital number, since it uses as much as digits as its factorization.

213111123839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 35.

The spelling of 213111123839 in words is "two hundred thirteen billion, one hundred eleven million, one hundred twenty-three thousand, eight hundred thirty-nine".