220122021121 has 4 divisors (see below), whose sum is σ = 220670954244. Its totient is φ = 219573088000.

The previous prime is 220122021113. The next prime is 220122021131. The reversal of 220122021121 is 121120221022.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121120221022 = 2 ⋅60560110511.

It can be written as a sum of positive squares in 2 ways, for example, as 152256040000 + 67865981121 = 390200^2 + 260511^2 .

It is a cyclic number.

It is not a de Polignac number, because 220122021121 - 2³ = 220122021113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220122021095 and 220122021104.

It is not an unprimeable number, because it can be changed into a prime (220122021131) 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, 274465960 + ... + 274466761.

It is an arithmetic number, because the mean of its divisors is an integer number (55167738561).

Almost surely, 2^220122021121 is an apocalyptic number.

It is an amenable number.

220122021121 is a deficient number, since it is larger than the sum of its proper divisors (548933123).

220122021121 is an equidigital number, since it uses as much as digits as its factorization.

220122021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548933122.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 220122021121 its reverse (121120221022), we get a palindrome (341242242143).

The spelling of 220122021121 in words is "two hundred twenty billion, one hundred twenty-two million, twenty-one thousand, one hundred twenty-one".