111543024421 has 2 divisors, whose sum is σ = 111543024422. Its totient is φ = 111543024420.

The previous prime is 111543024413. The next prime is 111543024427. The reversal of 111543024421 is 124420345111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107521689025 + 4021335396 = 327905^2 + 63414^2 .

It is an emirp because it is prime and its reverse (124420345111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111543024421 - 2³ = 111543024413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111543024421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111543024427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55771512210 + 55771512211.

It is an arithmetic number, because the mean of its divisors is an integer number (55771512211).

Almost surely, 2^111543024421 is an apocalyptic number.

It is an amenable number.

111543024421 is a deficient number, since it is larger than the sum of its proper divisors (1).

111543024421 is an equidigital number, since it uses as much as digits as its factorization.

111543024421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 28.

Adding to 111543024421 its reverse (124420345111), we get a palindrome (235963369532).

The spelling of 111543024421 in words is "one hundred eleven billion, five hundred forty-three million, twenty-four thousand, four hundred twenty-one".