21185148854627 has 4 divisors (see below), whose sum is σ = 21532446376896. Its totient is φ = 20837851332360.

The previous prime is 21185148854561. The next prime is 21185148854659. The reversal of 21185148854627 is 72645884158112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21185148854627 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21185148854627.

It is not an unprimeable number, because it can be changed into a prime (21185148854677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173648761043 + ... + 173648761164.

It is an arithmetic number, because the mean of its divisors is an integer number (5383111594224).

Almost surely, 2^{21185148854627} is an apocalyptic number.

21185148854627 is a deficient number, since it is larger than the sum of its proper divisors (347297522269).

21185148854627 is an equidigital number, since it uses as much as digits as its factorization.

21185148854627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347297522268.

The product of its digits is 34406400, while the sum is 62.

The spelling of 21185148854627 in words is "twenty-one trillion, one hundred eighty-five billion, one hundred forty-eight million, eight hundred fifty-four thousand, six hundred twenty-seven".