2001233221 has 4 divisors (see below), whose sum is σ = 2155174252. Its totient is φ = 1847292192.

The previous prime is 2001233207. The next prime is 2001233233. The reversal of 2001233221 is 1223321002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 299670721 + 1701562500 = 17311^2 + 41250^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001233221 - 2²⁵ = 1967678789 is a prime.

It is a super-3 number, since 3×2001233221³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001233195 and 2001233204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001233261) 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, 76970496 + ... + 76970521.

It is an arithmetic number, because the mean of its divisors is an integer number (538793563).

Almost surely, 2^2001233221 is an apocalyptic number.

It is an amenable number.

2001233221 is a deficient number, since it is larger than the sum of its proper divisors (153941031).

2001233221 is a wasteful number, since it uses less digits than its factorization.

2001233221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153941030.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 2001233221 is about 44735.1452551570. The cubic root of 2001233221 is about 1260.1799568701.

Adding to 2001233221 its reverse (1223321002), we get a palindrome (3224554223).

The spelling of 2001233221 in words is "two billion, one million, two hundred thirty-three thousand, two hundred twenty-one".