221121111101 has 4 divisors (see below), whose sum is σ = 241223030304. Its totient is φ = 201019191900.

The previous prime is 221121111059. The next prime is 221121111109. The reversal of 221121111101 is 101111121122.

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 221121111101 - 2⁶ = 221121111037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121111109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10050959585 + ... + 10050959606.

It is an arithmetic number, because the mean of its divisors is an integer number (60305757576).

Almost surely, 2^221121111101 is an apocalyptic number.

It is an amenable number.

221121111101 is a deficient number, since it is larger than the sum of its proper divisors (20101919203).

221121111101 is a wasteful number, since it uses less digits than its factorization.

221121111101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20101919202.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 221121111101 its reverse (101111121122), we get a palindrome (322232232223).

The spelling of 221121111101 in words is "two hundred twenty-one billion, one hundred twenty-one million, one hundred eleven thousand, one hundred one".