221111221001 has 8 divisors (see below), whose sum is σ = 241233623904. Its totient is φ = 200992381920.

The previous prime is 221111220991. The next prime is 221111221003. The reversal of 221111221001 is 100122111122.

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

It is not a de Polignac number, because 221111221001 - 2²² = 221107026697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221111221003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 760391 + ... + 1010156.

It is an arithmetic number, because the mean of its divisors is an integer number (30154202988).

Almost surely, 2^221111221001 is an apocalyptic number.

It is an amenable number.

221111221001 is a deficient number, since it is larger than the sum of its proper divisors (20122402903).

221111221001 is a wasteful number, since it uses less digits than its factorization.

221111221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1781911.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 221111221001 its reverse (100122111122), we get a palindrome (321233332123).

It can be divided in two parts, 22111122 and 1001, that multiplied together give a palindrome (22133233122).

The spelling of 221111221001 in words is "two hundred twenty-one billion, one hundred eleven million, two hundred twenty-one thousand, one".