205420511212 has 48 divisors (see below), whose sum is σ = 411846561280. Its totient is φ = 87822081792.

The previous prime is 205420511209. The next prime is 205420511221. The reversal of 205420511212 is 212115024502.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52818964 + ... + 52822852.

Almost surely, 2^205420511212 is an apocalyptic number.

It is an amenable number.

205420511212 is an abundant number, since it is smaller than the sum of its proper divisors (206426050068).

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

205420511212 is a wasteful number, since it uses less digits than its factorization.

205420511212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8030 (or 8028 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 205420511212 its reverse (212115024502), we get a palindrome (417535535714).

The spelling of 205420511212 in words is "two hundred five billion, four hundred twenty million, five hundred eleven thousand, two hundred twelve".