1001433221 has 4 divisors (see below), whose sum is σ = 1007028000. Its totient is φ = 995838444.

The previous prime is 1001433217. The next prime is 1001433287. The reversal of 1001433221 is 1223341001.

1001433221 = 378² + 379² + ... + 1451².

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, and also an emirpimes, since its reverse is a distinct semiprime: 1223341001 = 7559 ⋅161839.

It is a cyclic number.

It is not a de Polignac number, because 1001433221 - 2² = 1001433217 is a prime.

It is a super-2 number, since 2×1001433221² = 2005736992244869682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1001433221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001433211) 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, 2797121 + ... + 2797478.

It is an arithmetic number, because the mean of its divisors is an integer number (251757000).

Almost surely, 2^1001433221 is an apocalyptic number.

It is an amenable number.

1001433221 is a deficient number, since it is larger than the sum of its proper divisors (5594779).

1001433221 is an equidigital number, since it uses as much as digits as its factorization.

1001433221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5594778.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1001433221 is about 31645.4297016173. The cubic root of 1001433221 is about 1000.4775122791.

Adding to 1001433221 its reverse (1223341001), we get a palindrome (2224774222).

The spelling of 1001433221 in words is "one billion, one million, four hundred thirty-three thousand, two hundred twenty-one".