111222021001 has 48 divisors (see below), whose sum is σ = 144653983488. Its totient is φ = 83263593600.

The previous prime is 111222020977. The next prime is 111222021007. The reversal of 111222021001 is 100120222111.

It is not a de Polignac number, because 111222021001 - 2¹⁵ = 111221988233 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (111222021007) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 34853316 + ... + 34856506.

It is an arithmetic number, because the mean of its divisors is an integer number (3013624656).

Almost surely, 2^111222021001 is an apocalyptic number.

It is an amenable number.

111222021001 is a deficient number, since it is larger than the sum of its proper divisors (33431962487).

111222021001 is a wasteful number, since it uses less digits than its factorization.

111222021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4310 (or 4291 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 111222021001 its reverse (100120222111), we get a palindrome (211342243112).

The spelling of 111222021001 in words is "one hundred eleven billion, two hundred twenty-two million, twenty-one thousand, one".