2001242221 has 16 divisors (see below), whose sum is σ = 2222948160. Its totient is φ = 1786389120.

The previous prime is 2001242209. The next prime is 2001242233. The reversal of 2001242221 is 1222421002.

It is an interprime number because it is at equal distance from previous prime (2001242209) and next prime (2001242233).

It is a cyclic number.

It is not a de Polignac number, because 2001242221 - 2¹³ = 2001234029 is a prime.

It is a super-2 number, since 2×2001242221² = 8009940854226025682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001242195 and 2001242204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001242291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178446 + ... + 189328.

It is an arithmetic number, because the mean of its divisors is an integer number (138934260).

Almost surely, 2^2001242221 is an apocalyptic number.

It is an amenable number.

2001242221 is a deficient number, since it is larger than the sum of its proper divisors (221705939).

2001242221 is a wasteful number, since it uses less digits than its factorization.

2001242221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11196.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 2001242221 is about 44735.2458470947. The cubic root of 2001242221 is about 1260.1818459723.

Adding to 2001242221 its reverse (1222421002), we get a palindrome (3223663223).

It can be divided in two parts, 200 and 1242221, that added together give a palindrome (1242421).

The spelling of 2001242221 in words is "two billion, one million, two hundred forty-two thousand, two hundred twenty-one".