220221021121021 has 8 divisors (see below), whose sum is σ = 224385803615160. Its totient is φ = 216056596733952.

The previous prime is 220221021120917. The next prime is 220221021121027. The reversal of 220221021121021 is 120121120122022.

It can be written as a sum of positive squares in 4 ways, for example, as 34441804013796 + 185779217107225 = 5868714^2 + 13630085^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220221021121021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220221021121021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220221021121027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88285060 + ... + 90745213.

It is an arithmetic number, because the mean of its divisors is an integer number (28048225451895).

Almost surely, 2^{220221021121021} is an apocalyptic number.

It is an amenable number.

220221021121021 is a deficient number, since it is larger than the sum of its proper divisors (4164782494139).

220221021121021 is a wasteful number, since it uses less digits than its factorization.

220221021121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179053535.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 220221021121021 its reverse (120121120122022), we get a palindrome (340342141243043).

The spelling of 220221021121021 in words is "two hundred twenty trillion, two hundred twenty-one billion, twenty-one million, one hundred twenty-one thousand, twenty-one".