20121220001204 has 24 divisors (see below), whose sum is σ = 41223962931648. Its totient is φ = 8413053658560.

The previous prime is 20121220001167. The next prime is 20121220001269. The reversal of 20121220001204 is 40210002212102.

It is a super-2 number, since 2×20121220001204² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 8763596414 + ... + 8763598709.

It is an arithmetic number, because the mean of its divisors is an integer number (1717665122152).

Almost surely, 2^{20121220001204} is an apocalyptic number.

It is an amenable number.

20121220001204 is an abundant number, since it is smaller than the sum of its proper divisors (21102742930444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20121220001204 is a wasteful number, since it uses less digits than its factorization.

20121220001204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17527195175 (or 17527195173 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20121220001204 its reverse (40210002212102), we get a palindrome (60331222213306).

The spelling of 20121220001204 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty million, one thousand, two hundred four".