222221200021 has 4 divisors (see below), whose sum is σ = 222222143500. Its totient is φ = 222220256544.

The previous prime is 222221199983. The next prime is 222221200031. The reversal of 222221200021 is 120002122222.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 19035720900 + 203185479121 = 137970^2 + 450761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222221200021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222221199968 and 222221200004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222221200031) 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, 209185 + ... + 698713.

It is an arithmetic number, because the mean of its divisors is an integer number (55555535875).

Almost surely, 2^222221200021 is an apocalyptic number.

It is an amenable number.

222221200021 is a deficient number, since it is larger than the sum of its proper divisors (943479).

222221200021 is an equidigital number, since it uses as much as digits as its factorization.

222221200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943478.

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

Adding to 222221200021 its reverse (120002122222), we get a palindrome (342223322243).

It can be divided in two parts, 22222 and 1200021, that multiplied together give a palindrome (26666866662).

The spelling of 222221200021 in words is "two hundred twenty-two billion, two hundred twenty-one million, two hundred thousand, twenty-one".