2225000021 has 4 divisors (see below), whose sum is σ = 2226004044. Its totient is φ = 2223996000.

The previous prime is 2225000017. The next prime is 2225000027. The reversal of 2225000021 is 1200005222.

2225000021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1176147025 + 1048852996 = 34295^2 + 32386^2 .

It is a cyclic number.

It is not a de Polignac number, because 2225000021 - 2² = 2225000017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2225000027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498680 + ... + 503121.

It is an arithmetic number, because the mean of its divisors is an integer number (556501011).

Almost surely, 2^2225000021 is an apocalyptic number.

It is an amenable number.

2225000021 is a deficient number, since it is larger than the sum of its proper divisors (1004023).

2225000021 is a wasteful number, since it uses less digits than its factorization.

2225000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004022.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 2225000021 is about 47169.9058828826. The cubic root of 2225000021 is about 1305.4993897160.

Adding to 2225000021 its reverse (1200005222), we get a palindrome (3425005243).

The spelling of 2225000021 in words is "two billion, two hundred twenty-five million, twenty-one", and thus it is an aban number.