2011231221 has 8 divisors (see below), whose sum is σ = 2691839040. Its totient is φ = 1335722112.

The previous prime is 2011231219. The next prime is 2011231231. The reversal of 2011231221 is 1221321102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2011231221 - 2¹ = 2011231219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2011231221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011231231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1273756 + ... + 1275333.

It is an arithmetic number, because the mean of its divisors is an integer number (336479880).

Almost surely, 2^2011231221 is an apocalyptic number.

It is an amenable number.

2011231221 is a deficient number, since it is larger than the sum of its proper divisors (680607819).

2011231221 is a wasteful number, since it uses less digits than its factorization.

2011231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2549355.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2011231221 is about 44846.7526249114. The cubic root of 2011231221 is about 1262.2750576071.

Adding to 2011231221 its reverse (1221321102), we get a palindrome (3232552323).

The spelling of 2011231221 in words is "two billion, eleven million, two hundred thirty-one thousand, two hundred twenty-one".