20212005115205 has 8 divisors (see below), whose sum is σ = 25681135911192. Its totient is φ = 15218450910208.

The previous prime is 20212005115199. The next prime is 20212005115223. The reversal of 20212005115205 is 50251150021202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2522763599041 + 17689241516164 = 1588321^2 + 4205858^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20212005115205 - 2²² = 20212000920901 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118894147652 + ... + 118894147821.

It is an arithmetic number, because the mean of its divisors is an integer number (3210141988899).

Almost surely, 2^{20212005115205} is an apocalyptic number.

It is an amenable number.

20212005115205 is a deficient number, since it is larger than the sum of its proper divisors (5469130795987).

20212005115205 is a wasteful number, since it uses less digits than its factorization.

20212005115205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237788295495.

The product of its (nonzero) digits is 2000, while the sum is 26.

Adding to 20212005115205 its reverse (50251150021202), we get a palindrome (70463155136407).

The spelling of 20212005115205 in words is "twenty trillion, two hundred twelve billion, five million, one hundred fifteen thousand, two hundred five".