21185148854630 has 64 divisors (see below), whose sum is σ = 39572391214080. Its totient is φ = 8160613129344.

The previous prime is 21185148854561. The next prime is 21185148854659. The reversal of 21185148854630 is 3645884158112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 19708127 + ... + 20755253.

It is an arithmetic number, because the mean of its divisors is an integer number (618318612720).

Almost surely, 2^{21185148854630} is an apocalyptic number.

21185148854630 is a deficient number, since it is larger than the sum of its proper divisors (18387242359450).

21185148854630 is a wasteful number, since it uses less digits than its factorization.

21185148854630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047893.

The product of its (nonzero) digits is 7372800, while the sum is 56.

The spelling of 21185148854630 in words is "twenty-one trillion, one hundred eighty-five billion, one hundred forty-eight million, eight hundred fifty-four thousand, six hundred thirty".