1221201121122 has 48 divisors (see below), whose sum is σ = 2877297421752. Its totient is φ = 372767270400.

The previous prime is 1221201121099. The next prime is 1221201121187. The reversal of 1221201121122 is 2211211021221.

1221201121122 is a `hidden beast` number, since 1 + 221 + 201 + 121 + 122 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1213476293241 + 7724827881 = 1101579^2 + 87891^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1221201121095 and 1221201121104.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53919129 + ... + 53941772.

Almost surely, 2^{1221201121122} is an apocalyptic number.

1221201121122 is an abundant number, since it is smaller than the sum of its proper divisors (1656096300630).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221201121122 is a wasteful number, since it uses less digits than its factorization.

1221201121122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107860963 (or 107860960 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1221201121122 its reverse (2211211021221), we get a palindrome (3432412142343).

Subtracting 1221201121122 from its reverse (2211211021221), we obtain a palindrome (990009900099).

The spelling of 1221201121122 in words is "one trillion, two hundred twenty-one billion, two hundred one million, one hundred twenty-one thousand, one hundred twenty-two".