111211220112021 has 64 divisors (see below), whose sum is σ = 179027588505600. Its totient is φ = 67971266380800.

The previous prime is 111211220111963. The next prime is 111211220112053. The reversal of 111211220112021 is 120211022112111.

It is a happy number.

111211220112021 is a `hidden beast` number, since 111 + 211 + 2 + 201 + 120 + 21 = 666.

It is not a de Polignac number, because 111211220112021 - 2²⁹ = 111210683241109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111211220111985 and 111211220112003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211220112221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1190944885 + ... + 1191038261.

It is an arithmetic number, because the mean of its divisors is an integer number (2797306070400).

Almost surely, 2^{111211220112021} is an apocalyptic number.

It is an amenable number.

111211220112021 is a deficient number, since it is larger than the sum of its proper divisors (67816368393579).

111211220112021 is a wasteful number, since it uses less digits than its factorization.

111211220112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168327 (or 168321 counting only the distinct ones).

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

Adding to 111211220112021 its reverse (120211022112111), we get a palindrome (231422242224132).

The spelling of 111211220112021 in words is "one hundred eleven trillion, two hundred eleven billion, two hundred twenty million, one hundred twelve thousand, twenty-one".