212111623 has 2 divisors, whose sum is σ = 212111624. Its totient is φ = 212111622.

The previous prime is 212111621. The next prime is 212111629. The reversal of 212111623 is 326111212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212111623 - 2¹ = 212111621 is a prime.

It is a super-2 number, since 2×212111623² = 89982681223388258, which contains 22 as substring.

Together with 212111621, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 212111623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212111621) 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, 106055811 + 106055812.

It is an arithmetic number, because the mean of its divisors is an integer number (106055812).

Almost surely, 2^212111623 is an apocalyptic number.

212111623 is a deficient number, since it is larger than the sum of its proper divisors (1).

212111623 is an equidigital number, since it uses as much as digits as its factorization.

212111623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 19.

The square root of 212111623 is about 14564.0524236903. The cubic root of 212111623 is about 596.3778280463.

Adding to 212111623 its reverse (326111212), we get a palindrome (538222835).

The spelling of 212111623 in words is "two hundred twelve million, one hundred eleven thousand, six hundred twenty-three".