1201212212121 has 12 divisors (see below), whose sum is σ = 1764492515760. Its totient is φ = 787235121720.

The previous prime is 1201212212117. The next prime is 1201212212129. The reversal of 1201212212121 is 1212122121021.

1201212212121 is a `hidden beast` number, since 120 + 1 + 212 + 212 + 121 = 666.

It is not a de Polignac number, because 1201212212121 - 2² = 1201212212117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1201212212094 and 1201212212103.

It is not an unprimeable number, because it can be changed into a prime (1201212212129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1131084415 + ... + 1131085476.

It is an arithmetic number, because the mean of its divisors is an integer number (147041042980).

Almost surely, 2^{1201212212121} is an apocalyptic number.

It is an amenable number.

1201212212121 is a deficient number, since it is larger than the sum of its proper divisors (563280303639).

1201212212121 is a wasteful number, since it uses less digits than its factorization.

1201212212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2262169956 (or 2262169953 counting only the distinct ones).

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

Adding to 1201212212121 its reverse (1212122121021), we get a palindrome (2413334333142).

The spelling of 1201212212121 in words is "one trillion, two hundred one billion, two hundred twelve million, two hundred twelve thousand, one hundred twenty-one".