20121201205 has 32 divisors (see below), whose sum is σ = 29496918528. Its totient is φ = 12875596800.

The previous prime is 20121201203. The next prime is 20121201209. The reversal of 20121201205 is 50210212102.

It is a happy number.

It is not a de Polignac number, because 20121201205 - 2¹ = 20121201203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121201203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 271816 + ... + 337825.

It is an arithmetic number, because the mean of its divisors is an integer number (921778704).

Almost surely, 2^20121201205 is an apocalyptic number.

It is an amenable number.

20121201205 is a deficient number, since it is larger than the sum of its proper divisors (9375717323).

20121201205 is a wasteful number, since it uses less digits than its factorization.

20121201205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609717.

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 20121201205 its reverse (50210212102), we get a palindrome (70331413307).

The spelling of 20121201205 in words is "twenty billion, one hundred twenty-one million, two hundred one thousand, two hundred five".