1001233221 has 4 divisors (see below), whose sum is σ = 1334977632. Its totient is φ = 667488812.

The previous prime is 1001233201. The next prime is 1001233231. The reversal of 1001233221 is 1223321001.

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 1001233221 - 2⁶ = 1001233157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1001233221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001233201) 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, 166872201 + ... + 166872206.

It is an arithmetic number, because the mean of its divisors is an integer number (333744408).

Almost surely, 2^1001233221 is an apocalyptic number.

It is an amenable number.

1001233221 is a deficient number, since it is larger than the sum of its proper divisors (333744411).

1001233221 is an equidigital number, since it uses as much as digits as its factorization.

1001233221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333744410.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1001233221 is about 31642.2695298552. The cubic root of 1001233221 is about 1000.4109048008.

Adding to 1001233221 its reverse (1223321001), we get a palindrome (2224554222).

It can be divided in two parts, 100 and 1233221, that added together give a palindrome (1233321).

The spelling of 1001233221 in words is "one billion, one million, two hundred thirty-three thousand, two hundred twenty-one".