20213131233247 has 2 divisors, whose sum is σ = 20213131233248. Its totient is φ = 20213131233246.

The previous prime is 20213131233193. The next prime is 20213131233287. The reversal of 20213131233247 is 74233213131202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20213131233247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20213131233287) 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, 10106565616623 + 10106565616624.

It is an arithmetic number, because the mean of its divisors is an integer number (10106565616624).

Almost surely, 2^{20213131233247} is an apocalyptic number.

20213131233247 is a deficient number, since it is larger than the sum of its proper divisors (1).

20213131233247 is an equidigital number, since it uses as much as digits as its factorization.

20213131233247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 34.

Adding to 20213131233247 its reverse (74233213131202), we get a palindrome (94446344364449).

The spelling of 20213131233247 in words is "twenty trillion, two hundred thirteen billion, one hundred thirty-one million, two hundred thirty-three thousand, two hundred forty-seven".