220002202120021 has 8 divisors (see below), whose sum is σ = 225380527911000. Its totient is φ = 214624467682560.

The previous prime is 220002202120013. The next prime is 220002202120061. The reversal of 220002202120021 is 120021202200022.

It can be written as a sum of positive squares in 4 ways, for example, as 1586730719025 + 218415471400996 = 1259655^2 + 14778886^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 220002202120021 - 2³ = 220002202120013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220002202119977 and 220002202120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220002202120061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147085176 + ... + 148573393.

It is an arithmetic number, because the mean of its divisors is an integer number (28172565988875).

Almost surely, 2^{220002202120021} is an apocalyptic number.

It is an amenable number.

220002202120021 is a deficient number, since it is larger than the sum of its proper divisors (5378325790979).

220002202120021 is a wasteful number, since it uses less digits than its factorization.

220002202120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295676759.

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

Adding to 220002202120021 its reverse (120021202200022), we get a palindrome (340023404320043).

The spelling of 220002202120021 in words is "two hundred twenty trillion, two billion, two hundred two million, one hundred twenty thousand, twenty-one".