111121212021021 has 64 divisors (see below), whose sum is σ = 168816960829440. Its totient is φ = 72201490058880.

The previous prime is 111121212020981. The next prime is 111121212021091. The reversal of 111121212021021 is 120120212121111.

It is a happy number.

It is not a de Polignac number, because 111121212021021 - 2¹⁰ = 111121212019997 is a prime.

It is a super-2 number, since 2×111121212021021² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111121212020985 and 111121212021003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121212021091) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4267150761 + ... + 4267176801.

It is an arithmetic number, because the mean of its divisors is an integer number (2637765012960).

Almost surely, 2^{111121212021021} is an apocalyptic number.

It is an amenable number.

111121212021021 is a deficient number, since it is larger than the sum of its proper divisors (57695748808419).

111121212021021 is a wasteful number, since it uses less digits than its factorization.

111121212021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33903 (or 33897 counting only the distinct ones).

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

Adding to 111121212021021 its reverse (120120212121111), we get a palindrome (231241424142132).

The spelling of 111121212021021 in words is "one hundred eleven trillion, one hundred twenty-one billion, two hundred twelve million, twenty-one thousand, twenty-one".