111211312011021 has 24 divisors (see below), whose sum is σ = 165719965931520. Its totient is φ = 71813582595936.

The previous prime is 111211312011011. The next prime is 111211312011061. The reversal of 111211312011021 is 120110213112111.

111211312011021 is a `hidden beast` number, since 1 + 11 + 211 + 312 + 0 + 110 + 21 = 666.

It is not a de Polignac number, because 111211312011021 - 2²⁹ = 111210775140109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111211312010985 and 111211312011003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211312011011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 748732701 + ... + 748881218.

It is an arithmetic number, because the mean of its divisors is an integer number (6904998580480).

Almost surely, 2^{111211312011021} is an apocalyptic number.

It is an amenable number.

111211312011021 is a deficient number, since it is larger than the sum of its proper divisors (54508653920499).

111211312011021 is a wasteful number, since it uses less digits than its factorization.

111211312011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1497614185 (or 1497614182 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 18.

Adding to 111211312011021 its reverse (120110213112111), we get a palindrome (231321525123132).

The spelling of 111211312011021 in words is "one hundred eleven trillion, two hundred eleven billion, three hundred twelve million, eleven thousand, twenty-one".