111023212121 has 8 divisors (see below), whose sum is σ = 111781701000. Its totient is φ = 110264901760.

The previous prime is 111023212103. The next prime is 111023212127. The reversal of 111023212121 is 121212320111.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11838528025 + 99184684096 = 108805^2 + 314936^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111023212121 - 2¹⁰ = 111023211097 is a prime.

It is a super-2 number, since 2×111023212121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111023212121.

It is not an unprimeable number, because it can be changed into a prime (111023212127) 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 in 7 ways as a sum of consecutive naturals, for example, 1351925 + ... + 1431693.

It is an arithmetic number, because the mean of its divisors is an integer number (13972712625).

Almost surely, 2^111023212121 is an apocalyptic number.

It is an amenable number.

111023212121 is a deficient number, since it is larger than the sum of its proper divisors (758488879).

111023212121 is an equidigital number, since it uses as much as digits as its factorization.

111023212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89259.

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

Adding to 111023212121 its reverse (121212320111), we get a palindrome (232235532232).

It can be divided in two parts, 11102 and 3212121, that added together give a palindrome (3223223).

The spelling of 111023212121 in words is "one hundred eleven billion, twenty-three million, two hundred twelve thousand, one hundred twenty-one".