2220000021 has 64 divisors (see below), whose sum is σ = 3456000000. Its totient is φ = 1407295296.

The previous prime is 2219999989. The next prime is 2220000031. The reversal of 2220000021 is 1200000222.

It is not a de Polignac number, because 2220000021 - 2⁵ = 2219999989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2219999958 and 2220000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220000031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11155680 + ... + 11155878.

It is an arithmetic number, because the mean of its divisors is an integer number (54000000).

Almost surely, 2^2220000021 is an apocalyptic number.

It is an amenable number.

2220000021 is a deficient number, since it is larger than the sum of its proper divisors (1235999979).

2220000021 is a wasteful number, since it uses less digits than its factorization.

2220000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 2220000021 is about 47116.8761804091. The cubic root of 2220000021 is about 1304.5207541338.

Adding to 2220000021 its reverse (1200000222), we get a palindrome (3420000243).

The spelling of 2220000021 in words is "two billion, two hundred twenty million, twenty-one", and thus it is an aban number.