1221201103122 has 512 divisors, whose sum is σ = 3751199907840. Its totient is φ = 284239549440.

The previous prime is 1221201103097. The next prime is 1221201103139. The reversal of 1221201103122 is 2213011021221.

1221201103122 is a `hidden beast` number, since 1 + 221 + 20 + 110 + 312 + 2 = 666.

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 = 1221201103095 and 1221201103104.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 402106188 + ... + 402109224.

It is an arithmetic number, because the mean of its divisors is an integer number (7326562320).

Almost surely, 2^{1221201103122} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221201103122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1875599953920).

1221201103122 is an abundant number, since it is smaller than the sum of its proper divisors (2529998804718).

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

1221201103122 is a wasteful number, since it uses less digits than its factorization.

1221201103122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3295 (or 3289 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 1221201103122 its reverse (2213011021221), we get a palindrome (3434212124343).

The spelling of 1221201103122 in words is "one trillion, two hundred twenty-one billion, two hundred one million, one hundred three thousand, one hundred twenty-two".