221120111001 has 32 divisors (see below), whose sum is σ = 330302413440. Its totient is φ = 130758672384.

The previous prime is 221120110997. The next prime is 221120111089. The reversal of 221120111001 is 100111021122.

It is not a de Polignac number, because 221120111001 - 2² = 221120110997 is a prime.

It is a super-2 number, since 2×221120111001² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221120111101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 404160 + ... + 778193.

It is an arithmetic number, because the mean of its divisors is an integer number (10321950420).

Almost surely, 2^221120111001 is an apocalyptic number.

It is an amenable number.

221120111001 is a deficient number, since it is larger than the sum of its proper divisors (109182302439).

221120111001 is a wasteful number, since it uses less digits than its factorization.

221120111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182585.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 221120111001 its reverse (100111021122), we get a palindrome (321231132123).

The spelling of 221120111001 in words is "two hundred twenty-one billion, one hundred twenty million, one hundred eleven thousand, one".