222200021 has 4 divisors (see below), whose sum is σ = 223045152. Its totient is φ = 221354892.

The previous prime is 222199993. The next prime is 222200023. The reversal of 222200021 is 120002222.

222200021 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120002222 = 2 ⋅60001111.

It is a cyclic number.

It is not a de Polignac number, because 222200021 - 2²² = 218005717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222199975 and 222200011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222200023) 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, 422171 + ... + 422696.

It is an arithmetic number, because the mean of its divisors is an integer number (55761288).

Almost surely, 2^222200021 is an apocalyptic number.

It is an amenable number.

222200021 is a deficient number, since it is larger than the sum of its proper divisors (845131).

222200021 is an equidigital number, since it uses as much as digits as its factorization.

222200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845130.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 222200021 is about 14906.3751797679. The cubic root of 222200021 is about 605.6866924566.

Adding to 222200021 its reverse (120002222), we get a palindrome (342202243).

The spelling of 222200021 in words is "two hundred twenty-two million, two hundred thousand, twenty-one".