21186245107 has 2 divisors, whose sum is σ = 21186245108. Its totient is φ = 21186245106.

The previous prime is 21186245099. The next prime is 21186245221. The reversal of 21186245107 is 70154268112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21186245107 - 2³ = 21186245099 is a prime.

It is not a weakly prime, because it can be changed into another prime (21186275107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10593122553 + 10593122554.

It is an arithmetic number, because the mean of its divisors is an integer number (10593122554).

Almost surely, 2^21186245107 is an apocalyptic number.

21186245107 is a deficient number, since it is larger than the sum of its proper divisors (1).

21186245107 is an equidigital number, since it uses as much as digits as its factorization.

21186245107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 37.

The spelling of 21186245107 in words is "twenty-one billion, one hundred eighty-six million, two hundred forty-five thousand, one hundred seven".