20000231112221 has 2 divisors, whose sum is σ = 20000231112222. Its totient is φ = 20000231112220.

The previous prime is 20000231112217. The next prime is 20000231112233. The reversal of 20000231112221 is 12221113200002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10246721102500 + 9753510009721 = 3201050^2 + 3123061^2 .

It is a cyclic number.

It is not a de Polignac number, because 20000231112221 - 2² = 20000231112217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20000231112221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20000231118221) 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 as a sum of consecutive naturals, namely, 10000115556110 + 10000115556111.

It is an arithmetic number, because the mean of its divisors is an integer number (10000115556111).

Almost surely, 2^{20000231112221} is an apocalyptic number.

It is an amenable number.

20000231112221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20000231112221 is an equidigital number, since it uses as much as digits as its factorization.

20000231112221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20000231112221 its reverse (12221113200002), we get a palindrome (32221344312223).

The spelling of 20000231112221 in words is "twenty trillion, two hundred thirty-one million, one hundred twelve thousand, two hundred twenty-one".