111403124221 has 2 divisors, whose sum is σ = 111403124222. Its totient is φ = 111403124220.

The previous prime is 111403124219. The next prime is 111403124257. The reversal of 111403124221 is 122421304111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111238925625 + 164198596 = 333525^2 + 12814^2 .

It is a cyclic number.

It is not a de Polignac number, because 111403124221 - 2¹ = 111403124219 is a prime.

Together with 111403124219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 111403124192 and 111403124201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111403124281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55701562110 + 55701562111.

It is an arithmetic number, because the mean of its divisors is an integer number (55701562111).

Almost surely, 2^111403124221 is an apocalyptic number.

It is an amenable number.

111403124221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111403124221 is an equidigital number, since it uses as much as digits as its factorization.

111403124221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 111403124221 its reverse (122421304111), we get a palindrome (233824428332).

The spelling of 111403124221 in words is "one hundred eleven billion, four hundred three million, one hundred twenty-four thousand, two hundred twenty-one".