20312131012221 has 32 divisors (see below), whose sum is σ = 30186153878400. Its totient is φ = 12073706588160.

The previous prime is 20312131012219. The next prime is 20312131012249. The reversal of 20312131012221 is 12221013121302.

It is not a de Polignac number, because 20312131012221 - 2¹ = 20312131012219 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312131010221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32364835 + ... + 32986463.

It is an arithmetic number, because the mean of its divisors is an integer number (943317308700).

Almost surely, 2^{20312131012221} is an apocalyptic number.

It is an amenable number.

20312131012221 is a deficient number, since it is larger than the sum of its proper divisors (9874022866179).

20312131012221 is a wasteful number, since it uses less digits than its factorization.

20312131012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655389.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 20312131012221 its reverse (12221013121302), we get a palindrome (32533144133523).

The spelling of 20312131012221 in words is "twenty trillion, three hundred twelve billion, one hundred thirty-one million, twelve thousand, two hundred twenty-one".