2011221021 has 32 divisors (see below), whose sum is σ = 2832192000. Its totient is φ = 1267757568.

The previous prime is 2011220999. The next prime is 2011221049. The reversal of 2011221021 is 1201221102.

It is not a de Polignac number, because 2011221021 - 2⁶ = 2011220957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2011220988 and 2011221006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011221061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 842796 + ... + 845178.

It is an arithmetic number, because the mean of its divisors is an integer number (88506000).

Almost surely, 2^2011221021 is an apocalyptic number.

It is an amenable number.

2011221021 is a deficient number, since it is larger than the sum of its proper divisors (820970979).

2011221021 is a wasteful number, since it uses less digits than its factorization.

2011221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2613.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2011221021 is about 44846.6389041587. The cubic root of 2011221021 is about 1262.2729237190.

Adding to 2011221021 its reverse (1201221102), we get a palindrome (3212442123).

The spelling of 2011221021 in words is "two billion, eleven million, two hundred twenty-one thousand, twenty-one".