1212210212121 has 32 divisors (see below), whose sum is σ = 1823772049920. Its totient is φ = 795675541392.

The previous prime is 1212210212107. The next prime is 1212210212131. The reversal of 1212210212121 is 1212120122121.

1212210212121 is a `hidden beast` number, since 121 + 2 + 210 + 212 + 121 = 666.

It is not a de Polignac number, because 1212210212121 - 2¹⁰ = 1212210211097 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1212210212094 and 1212210212103.

It is not an unprimeable number, because it can be changed into a prime (1212210212131) 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 31 ways as a sum of consecutive naturals, for example, 816195 + ... + 1758008.

It is an arithmetic number, because the mean of its divisors is an integer number (56992876560).

Almost surely, 2^{1212210212121} is an apocalyptic number.

It is an amenable number.

1212210212121 is a deficient number, since it is larger than the sum of its proper divisors (611561837799).

1212210212121 is a wasteful number, since it uses less digits than its factorization.

1212210212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2574482 (or 2574476 counting only the distinct ones).

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

Adding to 1212210212121 its reverse (1212120122121), we get a palindrome (2424330334242).

The spelling of 1212210212121 in words is "one trillion, two hundred twelve billion, two hundred ten million, two hundred twelve thousand, one hundred twenty-one".