111021221001001 has 16 divisors (see below), whose sum is σ = 114018359107968. Its totient is φ = 108037872835200.

The previous prime is 111021221000981. The next prime is 111021221001013. The reversal of 111021221001001 is 100100122120111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 111021221001001 - 2¹⁵ = 111021220968233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111021221001091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1071674716 + ... + 1071778306.

It is an arithmetic number, because the mean of its divisors is an integer number (7126147444248).

Almost surely, 2^{111021221001001} is an apocalyptic number.

It is an amenable number.

111021221001001 is a deficient number, since it is larger than the sum of its proper divisors (2997138106967).

111021221001001 is a wasteful number, since it uses less digits than its factorization.

111021221001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169872.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111021221001001 its reverse (100100122120111), we get a palindrome (211121343121112).

The spelling of 111021221001001 in words is "one hundred eleven trillion, twenty-one billion, two hundred twenty-one million, one thousand, one".