20102105591 has 2 divisors, whose sum is σ = 20102105592. Its totient is φ = 20102105590.

The previous prime is 20102105509. The next prime is 20102105623. The reversal of 20102105591 is 19550120102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20102105591 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20102105591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20102107591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10051052795 + 10051052796.

It is an arithmetic number, because the mean of its divisors is an integer number (10051052796).

Almost surely, 2^20102105591 is an apocalyptic number.

20102105591 is a deficient number, since it is larger than the sum of its proper divisors (1).

20102105591 is an equidigital number, since it uses as much as digits as its factorization.

20102105591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 26.

Adding to 20102105591 its reverse (19550120102), we get a palindrome (39652225693).

The spelling of 20102105591 in words is "twenty billion, one hundred two million, one hundred five thousand, five hundred ninety-one".