111211002222021 has 64 divisors (see below), whose sum is σ = 178507722032640. Its totient is φ = 68022511464960.

The previous prime is 111211002222013. The next prime is 111211002222269. The reversal of 111211002222021 is 120222200112111.

It is not a de Polignac number, because 111211002222021 - 2³ = 111211002222013 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111211002221985 and 111211002222003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211002222721) 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, 116867881 + ... + 117815633.

It is an arithmetic number, because the mean of its divisors is an integer number (2789183156760).

Almost surely, 2^{111211002222021} is an apocalyptic number.

It is an amenable number.

111211002222021 is a deficient number, since it is larger than the sum of its proper divisors (67296719810619).

111211002222021 is a wasteful number, since it uses less digits than its factorization.

111211002222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949803 (or 949797 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 111211002222021 its reverse (120222200112111), we get a palindrome (231433202334132).

The spelling of 111211002222021 in words is "one hundred eleven trillion, two hundred eleven billion, two million, two hundred twenty-two thousand, twenty-one".