111021222121121 has 24 divisors (see below), whose sum is σ = 123604830397440. Its totient is φ = 99612650966400.

The previous prime is 111021222121109. The next prime is 111021222121163. The reversal of 111021222121121 is 121121222120111.

It is a happy number.

It is not a de Polignac number, because 111021222121121 - 2¹⁰ = 111021222120097 is a prime.

It is a super-2 number, since 2×111021222121121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111021222121093 and 111021222121102.

It is not an unprimeable number, because it can be changed into a prime (111021222121321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27684401 + ... + 31439918.

It is an arithmetic number, because the mean of its divisors is an integer number (5150201266560).

Almost surely, 2^{111021222121121} is an apocalyptic number.

It is an amenable number.

111021222121121 is a deficient number, since it is larger than the sum of its proper divisors (12583608276319).

111021222121121 is a wasteful number, since it uses less digits than its factorization.

111021222121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59124657 (or 59124644 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 111021222121121 its reverse (121121222120111), we get a palindrome (232142444241232).

The spelling of 111021222121121 in words is "one hundred eleven trillion, twenty-one billion, two hundred twenty-two million, one hundred twenty-one thousand, one hundred twenty-one".