2221011021 has 4 divisors (see below), whose sum is σ = 2961348032. Its totient is φ = 1480674012.

The previous prime is 2221011007. The next prime is 2221011029. The reversal of 2221011021 is 1201101222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2221011021 - 2³¹ = 73527373 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2221010988 and 2221011006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221011029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 370168501 + ... + 370168506.

It is an arithmetic number, because the mean of its divisors is an integer number (740337008).

Almost surely, 2^2221011021 is an apocalyptic number.

It is an amenable number.

2221011021 is a deficient number, since it is larger than the sum of its proper divisors (740337011).

2221011021 is an equidigital number, since it uses as much as digits as its factorization.

2221011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740337010.

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

The square root of 2221011021 is about 47127.6035991647. The cubic root of 2221011021 is about 1304.7187526794.

Adding to 2221011021 its reverse (1201101222), we get a palindrome (3422112243).

The spelling of 2221011021 in words is "two billion, two hundred twenty-one million, eleven thousand, twenty-one".