21186614959 has 2 divisors, whose sum is σ = 21186614960. Its totient is φ = 21186614958.

The previous prime is 21186614957. The next prime is 21186615017. The reversal of 21186614959 is 95941668112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21186614959 - 2¹ = 21186614957 is a prime.

Together with 21186614957, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21186614957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10593307479 + 10593307480.

It is an arithmetic number, because the mean of its divisors is an integer number (10593307480).

Almost surely, 2^21186614959 is an apocalyptic number.

21186614959 is a deficient number, since it is larger than the sum of its proper divisors (1).

21186614959 is an equidigital number, since it uses as much as digits as its factorization.

21186614959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 52.

The spelling of 21186614959 in words is "twenty-one billion, one hundred eighty-six million, six hundred fourteen thousand, nine hundred fifty-nine".