21140125091 has 2 divisors, whose sum is σ = 21140125092. Its totient is φ = 21140125090.

The previous prime is 21140125081. The next prime is 21140125163. The reversal of 21140125091 is 19052104112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21140125091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21140125091.

It is not a weakly prime, because it can be changed into another prime (21140125031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570062545 + 10570062546.

It is an arithmetic number, because the mean of its divisors is an integer number (10570062546).

Almost surely, 2^21140125091 is an apocalyptic number.

21140125091 is a deficient number, since it is larger than the sum of its proper divisors (1).

21140125091 is an equidigital number, since it uses as much as digits as its factorization.

21140125091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 26.

The spelling of 21140125091 in words is "twenty-one billion, one hundred forty million, one hundred twenty-five thousand, ninety-one".