220900121 has 4 divisors (see below), whose sum is σ = 237892452. Its totient is φ = 203907792.

The previous prime is 220900111. The next prime is 220900123. The reversal of 220900121 is 121009022.

220900121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121009022 = 2 ⋅60504511.

It can be written as a sum of positive squares in 2 ways, for example, as 126810121 + 94090000 = 11261^2 + 9700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220900121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 220900121.

It is not an unprimeable number, because it can be changed into a prime (220900123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8496146 + ... + 8496171.

It is an arithmetic number, because the mean of its divisors is an integer number (59473113).

Almost surely, 2^220900121 is an apocalyptic number.

It is an amenable number.

220900121 is a deficient number, since it is larger than the sum of its proper divisors (16992331).

220900121 is a wasteful number, since it uses less digits than its factorization.

220900121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16992330.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 220900121 is about 14862.7090733823. The cubic root of 220900121 is about 604.5032655148.

Adding to 220900121 its reverse (121009022), we get a palindrome (341909143).

It can be divided in two parts, 2209001 and 21, that added together give a palindrome (2209022).

The spelling of 220900121 in words is "two hundred twenty million, nine hundred thousand, one hundred twenty-one".