1212221212101 has 24 divisors (see below), whose sum is σ = 1818550431360. Its totient is φ = 777546851136.

The previous prime is 1212221212063. The next prime is 1212221212123. The reversal of 1212221212101 is 1012121222121.

1212221212101 is a `hidden beast` number, since 1 + 212 + 221 + 21 + 210 + 1 = 666.

It is not a de Polignac number, because 1212221212101 - 2¹⁰ = 1212221211077 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212221212801) 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 23 ways as a sum of consecutive naturals, for example, 24261240 + ... + 24311153.

It is an arithmetic number, because the mean of its divisors is an integer number (75772934640).

Almost surely, 2^{1212221212101} is an apocalyptic number.

It is an amenable number.

1212221212101 is a deficient number, since it is larger than the sum of its proper divisors (606329219259).

1212221212101 is a wasteful number, since it uses less digits than its factorization.

1212221212101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48572505 (or 48572502 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1212221212101 its reverse (1012121222121), we get a palindrome (2224342434222).

The spelling of 1212221212101 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, two hundred twelve thousand, one hundred one".