1212211001121 has 16 divisors (see below), whose sum is σ = 1673144328960. Its totient is φ = 779746808960.

The previous prime is 1212211001077. The next prime is 1212211001149. The reversal of 1212211001121 is 1211001122121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1212211001121 - 2¹⁴ = 1212210984737 is a prime.

It is a super-2 number, since 2×1212211001121² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1212211001121.

It is not an unprimeable number, because it can be changed into a prime (1212211001191) 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 15 ways as a sum of consecutive naturals, for example, 4575225 + ... + 4832918.

It is an arithmetic number, because the mean of its divisors is an integer number (104571520560).

Almost surely, 2^{1212211001121} is an apocalyptic number.

It is an amenable number.

1212211001121 is a deficient number, since it is larger than the sum of its proper divisors (460933327839).

1212211001121 is a wasteful number, since it uses less digits than its factorization.

1212211001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9409656.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1212211001121 its reverse (1211001122121), we get a palindrome (2423212123242).

The spelling of 1212211001121 in words is "one trillion, two hundred twelve billion, two hundred eleven million, one thousand, one hundred twenty-one".