212111399 has 2 divisors, whose sum is σ = 212111400. Its totient is φ = 212111398.

The previous prime is 212111377. The next prime is 212111437. The reversal of 212111399 is 993111212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212111399 - 2²⁰ = 211062823 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212111309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106055699 + 106055700.

It is an arithmetic number, because the mean of its divisors is an integer number (106055700).

Almost surely, 2^212111399 is an apocalyptic number.

212111399 is a deficient number, since it is larger than the sum of its proper divisors (1).

212111399 is an equidigital number, since it uses as much as digits as its factorization.

212111399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 29.

The square root of 212111399 is about 14564.0447335210. The cubic root of 212111399 is about 596.3776181117.

It can be divided in two parts, 2121113 and 99, that added together give a palindrome (2121212).

The spelling of 212111399 in words is "two hundred twelve million, one hundred eleven thousand, three hundred ninety-nine".