220002121121 has 4 divisors (see below), whose sum is σ = 220006676244. Its totient is φ = 219997566000.

The previous prime is 220002121117. The next prime is 220002121153. The reversal of 220002121121 is 121121200022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121121200022 = 2 ⋅60560600011.

It can be written as a sum of positive squares in 2 ways, for example, as 86532458896 + 133469662225 = 294164^2 + 365335^2 .

It is a cyclic number.

It is not a de Polignac number, because 220002121121 - 2² = 220002121117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 220002121096 and 220002121105.

It is not an unprimeable number, because it can be changed into a prime (220002121921) 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, 2204330 + ... + 2301971.

It is an arithmetic number, because the mean of its divisors is an integer number (55001669061).

Almost surely, 2^220002121121 is an apocalyptic number.

It is an amenable number.

220002121121 is a deficient number, since it is larger than the sum of its proper divisors (4555123).

220002121121 is an equidigital number, since it uses as much as digits as its factorization.

220002121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4555122.

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

Adding to 220002121121 its reverse (121121200022), we get a palindrome (341123321143).

The spelling of 220002121121 in words is "two hundred twenty billion, two million, one hundred twenty-one thousand, one hundred twenty-one".