220101121002121 has 4 divisors (see below), whose sum is σ = 222120397341700. Its totient is φ = 218081844662544.

The previous prime is 220101121002107. The next prime is 220101121002181. The reversal of 220101121002121 is 121200121101022.

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 77874888855625 + 142226232146496 = 8824675^2 + 11925864^2 .

It is a cyclic number.

It is not a de Polignac number, because 220101121002121 - 2³³ = 220092531067529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220101121002095 and 220101121002104.

It is not an unprimeable number, because it can be changed into a prime (220101121002101) 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, 1009638169626 + ... + 1009638169843.

It is an arithmetic number, because the mean of its divisors is an integer number (55530099335425).

Almost surely, 2^{220101121002121} is an apocalyptic number.

It is an amenable number.

220101121002121 is a deficient number, since it is larger than the sum of its proper divisors (2019276339579).

220101121002121 is a wasteful number, since it uses less digits than its factorization.

220101121002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2019276339578.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 220101121002121 its reverse (121200121101022), we get a palindrome (341301242103143).

The spelling of 220101121002121 in words is "two hundred twenty trillion, one hundred one billion, one hundred twenty-one million, two thousand, one hundred twenty-one".