111013123021 has 2 divisors, whose sum is σ = 111013123022. Its totient is φ = 111013123020.

The previous prime is 111013123009. The next prime is 111013123037. The reversal of 111013123021 is 120321310111.

It is a happy number.

It is an a-pointer prime, because the next prime (111013123037) can be obtained adding 111013123021 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87343300521 + 23669822500 = 295539^2 + 153850^2 .

It is an emirp because it is prime and its reverse (120321310111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111013123021 - 2⁷ = 111013122893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111013122986 and 111013123004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111013123051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55506561510 + 55506561511.

It is an arithmetic number, because the mean of its divisors is an integer number (55506561511).

Almost surely, 2^111013123021 is an apocalyptic number.

It is an amenable number.

111013123021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111013123021 is an equidigital number, since it uses as much as digits as its factorization.

111013123021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 111013123021 its reverse (120321310111), we get a palindrome (231334433132).

The spelling of 111013123021 in words is "one hundred eleven billion, thirteen million, one hundred twenty-three thousand, twenty-one".