2221200021 has 8 divisors (see below), whose sum is σ = 3041643424. Its totient is φ = 1440778320.

The previous prime is 2221200017. The next prime is 2221200031. The reversal of 2221200021 is 1200021222.

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

It is not a de Polignac number, because 2221200021 - 2² = 2221200017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221200001) 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 7 ways as a sum of consecutive naturals, for example, 10005295 + ... + 10005516.

It is an arithmetic number, because the mean of its divisors is an integer number (380205428).

Almost surely, 2^2221200021 is an apocalyptic number.

It is an amenable number.

2221200021 is a deficient number, since it is larger than the sum of its proper divisors (820443403).

2221200021 is a wasteful number, since it uses less digits than its factorization.

2221200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20010851.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 2221200021 is about 47129.6087507630. The cubic root of 2221200021 is about 1304.7557605777.

Adding to 2221200021 its reverse (1200021222), we get a palindrome (3421221243).

It can be divided in two parts, 222 and 1200021, that multiplied together give a palindrome (266404662).

The spelling of 2221200021 in words is "two billion, two hundred twenty-one million, two hundred thousand, twenty-one".