2222220021 has 24 divisors (see below), whose sum is σ = 3498167520. Its totient is φ = 1250881632.

The previous prime is 2222219999. The next prime is 2222220047. The reversal of 2222220021 is 1200222222.

It is not a de Polignac number, because 2222220021 - 2⁹ = 2222219509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2222220061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 102966 + ... + 122663.

It is an arithmetic number, because the mean of its divisors is an integer number (145756980).

Almost surely, 2^2222220021 is an apocalyptic number.

2222220021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2222220021 is a deficient number, since it is larger than the sum of its proper divisors (1275947499).

2222220021 is a wasteful number, since it uses less digits than its factorization.

2222220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225713 (or 225706 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 2222220021 is about 47140.4287316100. The cubic root of 2222220021 is about 1304.9554495148.

Adding to 2222220021 its reverse (1200222222), we get a palindrome (3422442243).

The spelling of 2222220021 in words is "two billion, two hundred twenty-two million, two hundred twenty thousand, twenty-one".