111212121023 has 2 divisors, whose sum is σ = 111212121024. Its totient is φ = 111212121022.

The previous prime is 111212120989. The next prime is 111212121061. The reversal of 111212121023 is 320121212111.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111212121023 - 2¹⁴ = 111212104639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111212120992 and 111212121010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111212121323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55606060511 + 55606060512.

It is an arithmetic number, because the mean of its divisors is an integer number (55606060512).

Almost surely, 2^111212121023 is an apocalyptic number.

111212121023 is a deficient number, since it is larger than the sum of its proper divisors (1).

111212121023 is an equidigital number, since it uses as much as digits as its factorization.

111212121023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 111212121023 its reverse (320121212111), we get a palindrome (431333333134).

The spelling of 111212121023 in words is "one hundred eleven billion, two hundred twelve million, one hundred twenty-one thousand, twenty-three".