1212210121121 has 8 divisors (see below), whose sum is σ = 1287957837960. Its totient is φ = 1140903638784.

The previous prime is 1212210121103. The next prime is 1212210121123. The reversal of 1212210121121 is 1211210122121.

It can be written as a sum of positive squares in 4 ways, for example, as 71075560000 + 1141134561121 = 266600^2 + 1068239^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1212210121121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212210121121.

It is not an unprimeable number, because it can be changed into a prime (1212210121123) 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 7 ways as a sum of consecutive naturals, for example, 123362696 + ... + 123372521.

It is an arithmetic number, because the mean of its divisors is an integer number (160994729745).

Almost surely, 2^{1212210121121} is an apocalyptic number.

It is an amenable number.

1212210121121 is a deficient number, since it is larger than the sum of its proper divisors (75747716839).

1212210121121 is an frugal number, since it uses more digits than its factorization.

1212210121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246735268 (or 246735234 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1212210121121 its reverse (1211210122121), we get a palindrome (2423420243242).

It can be divided in two parts, 1212210 and 121121, that added together give a palindrome (1333331).

The spelling of 1212210121121 in words is "one trillion, two hundred twelve billion, two hundred ten million, one hundred twenty-one thousand, one hundred twenty-one".