111111022212021 has 12 divisors (see below), whose sum is σ = 172839367885548. Its totient is φ = 68376013668864.

The previous prime is 111111022211993. The next prime is 111111022212023. The reversal of 111111022212021 is 120212220111111.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 42301508689521 + 68809513522500 = 6503961^2 + 8295150^2 .

It is not a de Polignac number, because 111111022212021 - 2³¹ = 111108874728373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111111022211985 and 111111022212003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111022212023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 474833428140 + ... + 474833428373.

It is an arithmetic number, because the mean of its divisors is an integer number (14403280657129).

Almost surely, 2^{111111022212021} is an apocalyptic number.

It is an amenable number.

111111022212021 is a deficient number, since it is larger than the sum of its proper divisors (61728345673527).

111111022212021 is a wasteful number, since it uses less digits than its factorization.

111111022212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949666856532 (or 949666856529 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 111111022212021 its reverse (120212220111111), we get a palindrome (231323242323132).

The spelling of 111111022212021 in words is "one hundred eleven trillion, one hundred eleven billion, twenty-two million, two hundred twelve thousand, twenty-one".