220121102221121 has 4 divisors (see below), whose sum is σ = 220121166031572. Its totient is φ = 220121038410672.

The previous prime is 220121102221117. The next prime is 220121102221133. The reversal of 220121102221121 is 121122201121022.

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 177308159435521 + 42812942785600 = 13315711^2 + 6543160^2 .

It is a cyclic number.

It is not a de Polignac number, because 220121102221121 - 2² = 220121102221117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220121102221093 and 220121102221102.

It is not an unprimeable number, because it can be changed into a prime (220121102221171) 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 3 ways as a sum of consecutive naturals, for example, 26416010 + ... + 33734963.

It is an arithmetic number, because the mean of its divisors is an integer number (55030291507893).

Almost surely, 2^{220121102221121} is an apocalyptic number.

It is an amenable number.

220121102221121 is a deficient number, since it is larger than the sum of its proper divisors (63810451).

220121102221121 is an equidigital number, since it uses as much as digits as its factorization.

220121102221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63810450.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 220121102221121 its reverse (121122201121022), we get a palindrome (341243303342143).

The spelling of 220121102221121 in words is "two hundred twenty trillion, one hundred twenty-one billion, one hundred two million, two hundred twenty-one thousand, one hundred twenty-one".