1212212021121 has 8 divisors (see below), whose sum is σ = 1795869660960. Its totient is φ = 808141347396.

The previous prime is 1212212021071. The next prime is 1212212021161. The reversal of 1212212021121 is 1211202122121.

1212212021121 is a `hidden beast` number, since 121 + 221 + 202 + 1 + 121 = 666.

It is not a de Polignac number, because 1212212021121 - 2¹⁷ = 1212211890049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212212021094 and 1212212021103.

It is not an unprimeable number, because it can be changed into a prime (1212212021161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22448370735 + ... + 22448370788.

It is an arithmetic number, because the mean of its divisors is an integer number (224483707620).

Almost surely, 2^{1212212021121} is an apocalyptic number.

It is an amenable number.

1212212021121 is a deficient number, since it is larger than the sum of its proper divisors (583657639839).

1212212021121 is an equidigital number, since it uses as much as digits as its factorization.

1212212021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44896741532 (or 44896741526 counting only the distinct ones).

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

Adding to 1212212021121 its reverse (1211202122121), we get a palindrome (2423414143242).

The spelling of 1212212021121 in words is "one trillion, two hundred twelve billion, two hundred twelve million, twenty-one thousand, one hundred twenty-one".