1212002012221 has 96 divisors (see below), whose sum is σ = 1739330869248. Its totient is φ = 815423708160.

The previous prime is 1212002012183. The next prime is 1212002012239. The reversal of 1212002012221 is 1222102002121.

It is a happy number.

It is not a de Polignac number, because 1212002012221 - 2¹⁹ = 1212001487933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212002012195 and 1212002012204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212002012821) 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 95 ways as a sum of consecutive naturals, for example, 47141256 + ... + 47166958.

It is an arithmetic number, because the mean of its divisors is an integer number (18118029888).

Almost surely, 2^{1212002012221} is an apocalyptic number.

1212002012221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212002012221 is a deficient number, since it is larger than the sum of its proper divisors (527328857027).

1212002012221 is a wasteful number, since it uses less digits than its factorization.

1212002012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25931 (or 25914 counting only the distinct ones).

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

Adding to 1212002012221 its reverse (1222102002121), we get a palindrome (2434104014342).

The spelling of 1212002012221 in words is "one trillion, two hundred twelve billion, two million, twelve thousand, two hundred twenty-one".