1212001111121 has 4 divisors (see below), whose sum is σ = 1212116210544. Its totient is φ = 1211886011700.

The previous prime is 1212001111043. The next prime is 1212001111133. The reversal of 1212001111121 is 1211111002121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212001111121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212001111096 and 1212001111105.

It is not an unprimeable number, because it can be changed into a prime (1212001111171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57533915 + ... + 57554976.

It is an arithmetic number, because the mean of its divisors is an integer number (303029052636).

Almost surely, 2^{1212001111121} is an apocalyptic number.

It is an amenable number.

1212001111121 is a deficient number, since it is larger than the sum of its proper divisors (115099423).

1212001111121 is a wasteful number, since it uses less digits than its factorization.

1212001111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115099422.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1212001111121 its reverse (1211111002121), we get a palindrome (2423112113242).

It can be divided in two parts, 121200 and 1111121, that added together give a palindrome (1232321).

The spelling of 1212001111121 in words is "one trillion, two hundred twelve billion, one million, one hundred eleven thousand, one hundred twenty-one".