20411443231391 has 2 divisors, whose sum is σ = 20411443231392. Its totient is φ = 20411443231390.

The previous prime is 20411443231379. The next prime is 20411443231409. The reversal of 20411443231391 is 19313234411402.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20411443231391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20411443231691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10205721615695 + 10205721615696.

It is an arithmetic number, because the mean of its divisors is an integer number (10205721615696).

Almost surely, 2^{20411443231391} is an apocalyptic number.

20411443231391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20411443231391 is an equidigital number, since it uses as much as digits as its factorization.

20411443231391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 38.

Adding to 20411443231391 its reverse (19313234411402), we get a palindrome (39724677642793).

The spelling of 20411443231391 in words is "twenty trillion, four hundred eleven billion, four hundred forty-three million, two hundred thirty-one thousand, three hundred ninety-one".