1221210121122 has 48 divisors (see below), whose sum is σ = 2749829820192. Its totient is φ = 406198294560.

The previous prime is 1221210121097. The next prime is 1221210121139. The reversal of 1221210121122 is 2211210121221.

1221210121122 is a `hidden beast` number, since 1 + 221 + 210 + 1 + 211 + 22 = 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 = 1221210121095 and 1221210121104.

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, 2463379 + ... + 2917302.

It is an arithmetic number, because the mean of its divisors is an integer number (57288121254).

Almost surely, 2^{1221210121122} is an apocalyptic number.

1221210121122 is an abundant number, since it is smaller than the sum of its proper divisors (1528619699070).

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

1221210121122 is an equidigital number, since it uses as much as digits as its factorization.

1221210121122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5381165 (or 5381153 counting only the distinct ones).

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

Adding to 1221210121122 its reverse (2211210121221), we get a palindrome (3432420242343).

Subtracting 1221210121122 from its reverse (2211210121221), we obtain a palindrome (990000000099).

The spelling of 1221210121122 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, one hundred twenty-one thousand, one hundred twenty-two".