111111121122021 has 32 divisors (see below), whose sum is σ = 167084594997120. Its totient is φ = 72968136982272.

The previous prime is 111111121121951. The next prime is 111111121122077. The reversal of 111111121122021 is 120221121111111.

It is not a de Polignac number, because 111111121122021 - 2²¹ = 111111119024869 is a prime.

It is a super-2 number, since 2×111111121122021² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111111121121985 and 111111121122003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111121123021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 111214146 + ... + 112208771.

It is an arithmetic number, because the mean of its divisors is an integer number (5221393593660).

Almost surely, 2^{111111121122021} is an apocalyptic number.

It is an amenable number.

111111121122021 is a deficient number, since it is larger than the sum of its proper divisors (55973473875099).

111111121122021 is a wasteful number, since it uses less digits than its factorization.

111111121122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223423202 (or 223423196 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 111111121122021 its reverse (120221121111111), we get a palindrome (231332242233132).

The spelling of 111111121122021 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred twenty-one million, one hundred twenty-two thousand, twenty-one".