10220221121221 has 4 divisors (see below), whose sum is σ = 10220279874700. Its totient is φ = 10220162367744.

The previous prime is 10220221121191. The next prime is 10220221121233. The reversal of 10220221121221 is 12212112202201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8365138985025 + 1855082136196 = 2892255^2 + 1362014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10220221121221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10220221121251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29115036 + ... + 29463973.

It is an arithmetic number, because the mean of its divisors is an integer number (2555069968675).

Almost surely, 2^{10220221121221} is an apocalyptic number.

It is an amenable number.

10220221121221 is a deficient number, since it is larger than the sum of its proper divisors (58753479).

10220221121221 is an equidigital number, since it uses as much as digits as its factorization.

10220221121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58753478.

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

Adding to 10220221121221 its reverse (12212112202201), we get a palindrome (22432333323422).

The spelling of 10220221121221 in words is "ten trillion, two hundred twenty billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-one".