1220122202121 has 24 divisors (see below), whose sum is σ = 1811165318664. Its totient is φ = 790934699520.

The previous prime is 1220122202113. The next prime is 1220122202147. The reversal of 1220122202121 is 1212022210221.

It is a happy number.

1220122202121 is a `hidden beast` number, since 1 + 220 + 12 + 220 + 212 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 11960703225 + 1208161498896 = 109365^2 + 1099164^2 .

It is not a de Polignac number, because 1220122202121 - 2³ = 1220122202113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220122202094 and 1220122202103.

It is not an unprimeable number, because it can be changed into a prime (1220122202191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 615360 + ... + 1678961.

It is an arithmetic number, because the mean of its divisors is an integer number (75465221611).

Almost surely, 2^{1220122202121} is an apocalyptic number.

It is an amenable number.

1220122202121 is a deficient number, since it is larger than the sum of its proper divisors (591043116543).

1220122202121 is a wasteful number, since it uses less digits than its factorization.

1220122202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2295961 (or 2295958 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1220122202121 its reverse (1212022210221), we get a palindrome (2432144412342).

The spelling of 1220122202121 in words is "one trillion, two hundred twenty billion, one hundred twenty-two million, two hundred two thousand, one hundred twenty-one".