20121011205 has 16 divisors (see below), whose sum is σ = 32195624064. Its totient is φ = 10730537280.

The previous prime is 20121011201. The next prime is 20121011221. The reversal of 20121011205 is 50211012102.

It is not a de Polignac number, because 20121011205 - 2² = 20121011201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121011201) 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, 293952 + ... + 355878.

It is an arithmetic number, because the mean of its divisors is an integer number (2012226504).

Almost surely, 2^20121011205 is an apocalyptic number.

It is an amenable number.

20121011205 is a deficient number, since it is larger than the sum of its proper divisors (12074612859).

20121011205 is a wasteful number, since it uses less digits than its factorization.

20121011205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83596.

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 20121011205 its reverse (50211012102), we get a palindrome (70332023307).

The spelling of 20121011205 in words is "twenty billion, one hundred twenty-one million, eleven thousand, two hundred five".