20121212002221 has 48 divisors (see below), whose sum is σ = 33758769245760. Its totient is φ = 11413220789760.

The previous prime is 20121212002219. The next prime is 20121212002223. The reversal of 20121212002221 is 12220021212102.

It is a happy number.

20121212002221 is a `hidden beast` number, since 201 + 21 + 21 + 200 + 2 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (20121212002219) and next prime (20121212002223).

It is not a de Polignac number, because 20121212002221 - 2¹ = 20121212002219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20121212002194 and 20121212002203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121212002223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33094170 + ... + 33696683.

It is an arithmetic number, because the mean of its divisors is an integer number (703307692620).

Almost surely, 2^{20121212002221} is an apocalyptic number.

It is an amenable number.

20121212002221 is a deficient number, since it is larger than the sum of its proper divisors (13637557243539).

20121212002221 is a wasteful number, since it uses less digits than its factorization.

20121212002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66791066 (or 66791063 counting only the distinct ones).

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

Adding to 20121212002221 its reverse (12220021212102), we get a palindrome (32341233214323).

The spelling of 20121212002221 in words is "twenty trillion, one hundred twenty-one billion, two hundred twelve million, two thousand, two hundred twenty-one".