111211210111021 has 16 divisors (see below), whose sum is σ = 116645968695168. Its totient is φ = 105826505400000.

The previous prime is 111211210110989. The next prime is 111211210111037. The reversal of 111211210111021 is 120111012112111.

It is a cyclic number.

It is not a de Polignac number, because 111211210111021 - 2⁵ = 111211210110989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111211210110986 and 111211210111004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211210111051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49887511 + ... + 52069051.

It is an arithmetic number, because the mean of its divisors is an integer number (7290373043448).

Almost surely, 2^{111211210111021} is an apocalyptic number.

It is an amenable number.

111211210111021 is a deficient number, since it is larger than the sum of its proper divisors (5434758584147).

111211210111021 is a wasteful number, since it uses less digits than its factorization.

111211210111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2193012.

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 111211210111021 its reverse (120111012112111), we get a palindrome (231322222223132).

The spelling of 111211210111021 in words is "one hundred eleven trillion, two hundred eleven billion, two hundred ten million, one hundred eleven thousand, twenty-one".