111001021221001 has 4 divisors (see below), whose sum is σ = 111097459989504. Its totient is φ = 110904582452500.

The previous prime is 111001021220849. The next prime is 111001021221017. The reversal of 111001021221001 is 100122120100111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111001021221001 - 2⁹ = 111001021220489 is a prime.

It is a super-2 number, since 2×111001021221001² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111001021221071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48219382525 + ... + 48219384826.

It is an arithmetic number, because the mean of its divisors is an integer number (27774364997376).

Almost surely, 2^{111001021221001} is an apocalyptic number.

It is an amenable number.

111001021221001 is a deficient number, since it is larger than the sum of its proper divisors (96438768503).

111001021221001 is an equidigital number, since it uses as much as digits as its factorization.

111001021221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96438768502.

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

Adding to 111001021221001 its reverse (100122120100111), we get a palindrome (211123141321112).

The spelling of 111001021221001 in words is "one hundred eleven trillion, one billion, twenty-one million, two hundred twenty-one thousand, one".