2011221221 has 8 divisors (see below), whose sum is σ = 2027786400. Its totient is φ = 1994697232.

The previous prime is 2011221217. The next prime is 2011221281. The reversal of 2011221221 is 1221221102.

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

It is a cyclic number.

It is not a de Polignac number, because 2011221221 - 2² = 2011221217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2011221196 and 2011221205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011221281) 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, 91886 + ... + 111648.

It is an arithmetic number, because the mean of its divisors is an integer number (253473300).

Almost surely, 2^2011221221 is an apocalyptic number.

It is an amenable number.

2011221221 is a deficient number, since it is larger than the sum of its proper divisors (16565179).

2011221221 is a wasteful number, since it uses less digits than its factorization.

2011221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20595.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2011221221 is about 44846.6411339801. The cubic root of 2011221221 is about 1262.2729655600.

Adding to 2011221221 its reverse (1221221102), we get a palindrome (3232442323).

The spelling of 2011221221 in words is "two billion, eleven million, two hundred twenty-one thousand, two hundred twenty-one".