221121111001 has 8 divisors (see below), whose sum is σ = 253051808960. Its totient is φ = 189275905008.

The previous prime is 221121110999. The next prime is 221121111007. The reversal of 221121111001 is 100111121122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221121111001 - 2¹ = 221121110999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221121111007) 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 7 ways as a sum of consecutive naturals, for example, 21367446 + ... + 21377791.

It is an arithmetic number, because the mean of its divisors is an integer number (31631476120).

Almost surely, 2^221121111001 is an apocalyptic number.

It is an amenable number.

221121111001 is a deficient number, since it is larger than the sum of its proper divisors (31930697959).

221121111001 is an equidigital number, since it uses as much as digits as its factorization.

221121111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42745983.

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

Adding to 221121111001 its reverse (100111121122), we get a palindrome (321232232123).

The spelling of 221121111001 in words is "two hundred twenty-one billion, one hundred twenty-one million, one hundred eleven thousand, one".