1212020210121 has 96 divisors (see below), whose sum is σ = 1989472003200. Its totient is φ = 653471400960.

The previous prime is 1212020210111. The next prime is 1212020210129. The reversal of 1212020210121 is 1210120202121.

It is not a de Polignac number, because 1212020210121 - 2¹⁰ = 1212020209097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212020210121.

It is not an unprimeable number, because it can be changed into a prime (1212020210129) 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 95 ways as a sum of consecutive naturals, for example, 33902826 + ... + 33938556.

It is an arithmetic number, because the mean of its divisors is an integer number (20723666700).

Almost surely, 2^{1212020210121} is an apocalyptic number.

It is an amenable number.

1212020210121 is a deficient number, since it is larger than the sum of its proper divisors (777451793079).

1212020210121 is a wasteful number, since it uses less digits than its factorization.

1212020210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35959 (or 35952 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1212020210121 its reverse (1210120202121), we get a palindrome (2422140412242).

It can be divided in two parts, 1212020 and 210121, that added together give a triangular number (1422141 = T₁₆₈₆).

The spelling of 1212020210121 in words is "one trillion, two hundred twelve billion, twenty million, two hundred ten thousand, one hundred twenty-one".