221001103231 has 4 divisors (see below), whose sum is σ = 221048768232. Its totient is φ = 220953438232.

The previous prime is 221001103163. The next prime is 221001103289. The reversal of 221001103231 is 132301100122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221001103231 - 2¹⁵ = 221001070463 is a prime.

It is a super-2 number, since 2×221001103231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001103291) 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, 23825545 + ... + 23834818.

It is an arithmetic number, because the mean of its divisors is an integer number (55262192058).

Almost surely, 2^221001103231 is an apocalyptic number.

221001103231 is a deficient number, since it is larger than the sum of its proper divisors (47665001).

221001103231 is an equidigital number, since it uses as much as digits as its factorization.

221001103231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47665000.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 221001103231 its reverse (132301100122), we get a palindrome (353302203353).

The spelling of 221001103231 in words is "two hundred twenty-one billion, one million, one hundred three thousand, two hundred thirty-one".