2200000021 has 4 divisors (see below), whose sum is σ = 2201035500. Its totient is φ = 2198964544.

The previous prime is 2200000009. The next prime is 2200000031. The reversal of 2200000021 is 1200000022.

It is a happy number.

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 610781796 + 1589218225 = 24714^2 + 39865^2 .

It is a cyclic number.

It is not a de Polignac number, because 2200000021 - 2⁹ = 2199999509 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 (2200000031) 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, 514546 + ... + 518803.

It is an arithmetic number, because the mean of its divisors is an integer number (550258875).

Almost surely, 2^2200000021 is an apocalyptic number.

It is an amenable number.

2200000021 is a deficient number, since it is larger than the sum of its proper divisors (1035479).

2200000021 is a wasteful number, since it uses less digits than its factorization.

2200000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035478.

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 2200000021 is about 46904.1578220950. The cubic root of 2200000021 is about 1300.5914509896.

Adding to 2200000021 its reverse (1200000022), we get a palindrome (3400000043).

Subtracting from 2200000021 its reverse (1200000022), we obtain a palindrome (999999999).

The spelling of 2200000021 in words is "two billion, two hundred million, twenty-one", and thus it is an aban number.