20121221002012 has 24 divisors (see below), whose sum is σ = 37920898949472. Its totient is φ = 9286684008000.

The previous prime is 20121221002007. The next prime is 20121221002013. The reversal of 20121221002012 is 21020012212102.

It is a happy number.

It is a super-2 number, since 2×20121221002012² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121221002013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19495137 + ... + 20501287.

It is an arithmetic number, because the mean of its divisors is an integer number (1580037456228).

Almost surely, 2^{20121221002012} is an apocalyptic number.

It is an amenable number.

20121221002012 is a deficient number, since it is larger than the sum of its proper divisors (17799677947460).

20121221002012 is a wasteful number, since it uses less digits than its factorization.

20121221002012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1390749 (or 1390747 counting only the distinct ones).

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

Adding to 20121221002012 its reverse (21020012212102), we get a palindrome (41141233214114).

The spelling of 20121221002012 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty-one million, two thousand, twelve".