220221100000121 has 4 divisors (see below), whose sum is σ = 240241200000144. Its totient is φ = 200201000000100.

The previous prime is 220221100000079. The next prime is 220221100000141. The reversal of 220221100000121 is 121000001122022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 220221100000121 - 2¹⁰ = 220221099999097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220221100000096 and 220221100000105.

It is not an unprimeable number, because it can be changed into a prime (220221100000141) 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, 10010049999995 + ... + 10010050000016.

It is an arithmetic number, because the mean of its divisors is an integer number (60060300000036).

Almost surely, 2^{220221100000121} is an apocalyptic number.

It is an amenable number.

220221100000121 is a deficient number, since it is larger than the sum of its proper divisors (20020100000023).

220221100000121 is a wasteful number, since it uses less digits than its factorization.

220221100000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20020100000022.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 220221100000121 its reverse (121000001122022), we get a palindrome (341221101122143).

The spelling of 220221100000121 in words is "two hundred twenty trillion, two hundred twenty-one billion, one hundred million, one hundred twenty-one", and thus it is an aban number.