1212200121121 has 4 divisors (see below), whose sum is σ = 1322400132144. Its totient is φ = 1102000110100.

The previous prime is 1212200121101. The next prime is 1212200121127. The reversal of 1212200121121 is 1211210022121.

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 not a de Polignac number, because 1212200121121 - 2⁷ = 1212200120993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212200121095 and 1212200121104.

It is not an unprimeable number, because it can be changed into a prime (1212200121127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55100005495 + ... + 55100005516.

It is an arithmetic number, because the mean of its divisors is an integer number (330600033036).

Almost surely, 2^{1212200121121} is an apocalyptic number.

1212200121121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212200121121 is a deficient number, since it is larger than the sum of its proper divisors (110200011023).

1212200121121 is a wasteful number, since it uses less digits than its factorization.

1212200121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110200011022.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1212200121121 its reverse (1211210022121), we get a palindrome (2423410143242).

The spelling of 1212200121121 in words is "one trillion, two hundred twelve billion, two hundred million, one hundred twenty-one thousand, one hundred twenty-one".