222120002200021 has 6 divisors (see below), whose sum is σ = 229516297799766. Its totient is φ = 214954840837800.

The previous prime is 222120002199883. The next prime is 222120002200043. The reversal of 222120002200021 is 120002200021222.

It can be written as a sum of positive squares in only one way, i.e., 182928708712996 + 39191293487025 = 13525114^2 + 6260295^2 .

It is not a de Polignac number, because 222120002200021 - 2¹⁷ = 222120002068949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222120002199968 and 222120002200004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222120002200081) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 115567117770 + ... + 115567119691.

It is an arithmetic number, because the mean of its divisors is an integer number (38252716299961).

Almost surely, 2^{222120002200021} is an apocalyptic number.

It is an amenable number.

222120002200021 is a deficient number, since it is larger than the sum of its proper divisors (7396295599745).

222120002200021 is an equidigital number, since it uses as much as digits as its factorization.

222120002200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231134237523 (or 231134237492 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 222120002200021 its reverse (120002200021222), we get a palindrome (342122202221243).

It can be divided in two parts, 222 and 120002200021, that multiplied together give a palindrome (26640488404662).

The spelling of 222120002200021 in words is "two hundred twenty-two trillion, one hundred twenty billion, two million, two hundred thousand, twenty-one".