2221210021 has 16 divisors (see below), whose sum is σ = 2489572800. Its totient is φ = 1971502848.

The previous prime is 2221209997. The next prime is 2221210031. The reversal of 2221210021 is 1200121222.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2221210021 - 2⁹ = 2221209509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221209983 and 2221210010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221210031) 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, 31191 + ... + 73588.

It is an arithmetic number, because the mean of its divisors is an integer number (155598300).

Almost surely, 2^2221210021 is an apocalyptic number.

It is an amenable number.

2221210021 is a deficient number, since it is larger than the sum of its proper divisors (268362779).

2221210021 is a wasteful number, since it uses less digits than its factorization.

2221210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104868.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2221210021 is about 47129.7148410639. The cubic root of 2221210021 is about 1304.7577186091.

Adding to 2221210021 its reverse (1200121222), we get a palindrome (3421331243).

The spelling of 2221210021 in words is "two billion, two hundred twenty-one million, two hundred ten thousand, twenty-one".