1212020210221 has 8 divisors (see below), whose sum is σ = 1223809966080. Its totient is φ = 1200230888592.

The previous prime is 1212020210213. The next prime is 1212020210293. The reversal of 1212020210221 is 1220120202121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1212020210221 - 2³ = 1212020210213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212020210195 and 1212020210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212020213221) 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 7 ways as a sum of consecutive naturals, for example, 10860735 + ... + 10971763.

It is an arithmetic number, because the mean of its divisors is an integer number (152976245760).

Almost surely, 2^{1212020210221} is an apocalyptic number.

It is an amenable number.

1212020210221 is a deficient number, since it is larger than the sum of its proper divisors (11789755859).

1212020210221 is a wasteful number, since it uses less digits than its factorization.

1212020210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217115.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1212020210221 its reverse (1220120202121), we get a palindrome (2432140412342).

It can be divided in two parts, 1212020 and 210221, that added together give a palindrome (1422241).

The spelling of 1212020210221 in words is "one trillion, two hundred twelve billion, twenty million, two hundred ten thousand, two hundred twenty-one".