111220212212021 has 64 divisors (see below), whose sum is σ = 127218196684800. Its totient is φ = 96305586048000.

The previous prime is 111220212211897. The next prime is 111220212212027. The reversal of 111220212212021 is 120212212022111.

It is a cyclic number.

It is not a de Polignac number, because 111220212212021 - 2³⁴ = 111203032342837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111220212211984 and 111220212212002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111220212212027) 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, 13783638575 + ... + 13783646643.

It is an arithmetic number, because the mean of its divisors is an integer number (1987784323200).

Almost surely, 2^{111220212212021} is an apocalyptic number.

111220212212021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111220212212021 is a deficient number, since it is larger than the sum of its proper divisors (15997984472779).

111220212212021 is a wasteful number, since it uses less digits than its factorization.

111220212212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9710.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 111220212212021 its reverse (120212212022111), we get a palindrome (231432424234132).

The spelling of 111220212212021 in words is "one hundred eleven trillion, two hundred twenty billion, two hundred twelve million, two hundred twelve thousand, twenty-one".