1212211121121 has 192 divisors, whose sum is σ = 2454117259776. Its totient is φ = 556288819200.

The previous prime is 1212211121087. The next prime is 1212211121153. The reversal of 1212211121121 is 1211211122121.

It is a happy number.

1212211121121 is a `hidden beast` number, since 1 + 212 + 211 + 121 + 121 = 666.

It is not a de Polignac number, because 1212211121121 - 2¹⁴ = 1212211104737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212211121094 and 1212211121103.

It is not an unprimeable number, because it can be changed into a prime (1212211121171) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 20303505 + ... + 20363121.

It is an arithmetic number, because the mean of its divisors is an integer number (12781860728).

Almost surely, 2^{1212211121121} is an apocalyptic number.

1212211121121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212211121121 is an abundant number, since it is smaller than the sum of its proper divisors (1241906138655).

1212211121121 is a wasteful number, since it uses less digits than its factorization.

1212211121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59752 (or 59749 counting only the distinct ones).

The product of its digits is 32, while the sum is 18.

Adding to 1212211121121 its reverse (1211211122121), we get a palindrome (2423422243242).

The spelling of 1212211121121 in words is "one trillion, two hundred twelve billion, two hundred eleven million, one hundred twenty-one thousand, one hundred twenty-one".