220121101 has 4 divisors (see below), whose sum is σ = 220711612. Its totient is φ = 219530592.

The previous prime is 220121093. The next prime is 220121141. The reversal of 220121101 is 101121022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 101121022 = 2 ⋅50560511.

It can be written as a sum of positive squares in 2 ways, for example, as 62015625 + 158105476 = 7875^2 + 12574^2 .

It is a cyclic number.

It is not a de Polignac number, because 220121101 - 2³ = 220121093 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 (220121141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 294696 + ... + 295441.

It is an arithmetic number, because the mean of its divisors is an integer number (55177903).

Almost surely, 2^220121101 is an apocalyptic number.

It is an amenable number.

220121101 is a deficient number, since it is larger than the sum of its proper divisors (590511).

220121101 is an equidigital number, since it uses as much as digits as its factorization.

220121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590510.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 220121101 is about 14836.4787264364. The cubic root of 220121101 is about 603.7918206067.

Adding to 220121101 its reverse (101121022), we get a palindrome (321242123).

The spelling of 220121101 in words is "two hundred twenty million, one hundred twenty-one thousand, one hundred one".