1212211112121 has 12 divisors (see below), whose sum is σ = 1753856246272. Its totient is φ = 806809369176.

The previous prime is 1212211112117. The next prime is 1212211112137. The reversal of 1212211112121 is 1212111122121.

It is a happy number.

1212211112121 is a `hidden beast` number, since 121 + 221 + 111 + 212 + 1 = 666.

It is not a de Polignac number, because 1212211112121 - 2² = 1212211112117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212211112094 and 1212211112103.

It is not an unprimeable number, because it can be changed into a prime (1212261112121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110941921 + ... + 110952846.

Almost surely, 2^{1212211112121} is an apocalyptic number.

It is an amenable number.

1212211112121 is a deficient number, since it is larger than the sum of its proper divisors (541645134151).

1212211112121 is a wasteful number, since it uses less digits than its factorization.

1212211112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221895380 (or 221895377 counting only the distinct ones).

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

Adding to 1212211112121 its reverse (1212111122121), we get a palindrome (2424322234242).

The spelling of 1212211112121 in words is "one trillion, two hundred twelve billion, two hundred eleven million, one hundred twelve thousand, one hundred twenty-one".