20331140343991 has 2 divisors, whose sum is σ = 20331140343992. Its totient is φ = 20331140343990.

The previous prime is 20331140343977. The next prime is 20331140344007. The reversal of 20331140343991 is 19934304113302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20331140343991 - 2⁵ = 20331140343959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20331140343971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165570171995 + 10165570171996.

It is an arithmetic number, because the mean of its divisors is an integer number (10165570171996).

Almost surely, 2^{20331140343991} is an apocalyptic number.

20331140343991 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331140343991 is an equidigital number, since it uses as much as digits as its factorization.

20331140343991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 43.

The spelling of 20331140343991 in words is "twenty trillion, three hundred thirty-one billion, one hundred forty million, three hundred forty-three thousand, nine hundred ninety-one".