221233111001 has 6 divisors (see below), whose sum is σ = 257352802650. Its totient is φ = 189628380816.

The previous prime is 221233110913. The next prime is 221233111009. The reversal of 221233111001 is 100111332122.

It can be written as a sum of positive squares in only one way, i.e., 178127046601 + 43106064400 = 422051^2 + 207620^2 .

It is not a de Polignac number, because 221233111001 - 2²² = 221228916697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221233111009) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2257480676 + ... + 2257480773.

It is an arithmetic number, because the mean of its divisors is an integer number (42892133775).

Almost surely, 2^221233111001 is an apocalyptic number.

It is an amenable number.

221233111001 is a deficient number, since it is larger than the sum of its proper divisors (36119691649).

221233111001 is an equidigital number, since it uses as much as digits as its factorization.

221233111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4514961463 (or 4514961456 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 221233111001 its reverse (100111332122), we get a palindrome (321344443123).

The spelling of 221233111001 in words is "two hundred twenty-one billion, two hundred thirty-three million, one hundred eleven thousand, one".