1212212002221 has 16 divisors (see below), whose sum is σ = 1959130509120. Its totient is φ = 734673940560.

The previous prime is 1212212002207. The next prime is 1212212002223. The reversal of 1212212002221 is 1222002122121.

It is a happy number.

1212212002221 is a `hidden beast` number, since 1 + 21 + 221 + 200 + 2 + 221 = 666.

It is not a de Polignac number, because 1212212002221 - 2⁹ = 1212212001709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212212002194 and 1212212002203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212212002223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2040760650 + ... + 2040761243.

It is an arithmetic number, because the mean of its divisors is an integer number (122445656820).

Almost surely, 2^{1212212002221} is an apocalyptic number.

1212212002221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212212002221 is a deficient number, since it is larger than the sum of its proper divisors (746918506899).

1212212002221 is a wasteful number, since it uses less digits than its factorization.

1212212002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4081521913 (or 4081521907 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1212212002221 its reverse (1222002122121), we get a palindrome (2434214124342).

The spelling of 1212212002221 in words is "one trillion, two hundred twelve billion, two hundred twelve million, two thousand, two hundred twenty-one".