20121076205 has 4 divisors (see below), whose sum is σ = 24145291452. Its totient is φ = 16096860960.

The previous prime is 20121076181. The next prime is 20121076211. The reversal of 20121076205 is 50267012102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14530373764 + 5590702441 = 120542^2 + 74771^2 .

It is not a de Polignac number, because 20121076205 - 2²² = 20116881901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2012107616 + ... + 2012107625.

It is an arithmetic number, because the mean of its divisors is an integer number (6036322863).

Almost surely, 2^20121076205 is an apocalyptic number.

It is an amenable number.

20121076205 is a deficient number, since it is larger than the sum of its proper divisors (4024215247).

20121076205 is an equidigital number, since it uses as much as digits as its factorization.

20121076205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4024215246.

The product of its (nonzero) digits is 1680, while the sum is 26.

Adding to 20121076205 its reverse (50267012102), we get a palindrome (70388088307).

The spelling of 20121076205 in words is "twenty billion, one hundred twenty-one million, seventy-six thousand, two hundred five".