21088388462806 has 16 divisors (see below), whose sum is σ = 36162184181760. Its totient is φ = 9035215494120.

The previous prime is 21088388462759. The next prime is 21088388462833. The reversal of 21088388462806 is 60826488388012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222057136 + ... + 222152083.

It is an arithmetic number, because the mean of its divisors is an integer number (2260136511360).

Almost surely, 2^{21088388462806} is an apocalyptic number.

21088388462806 is a deficient number, since it is larger than the sum of its proper divisors (15073795718954).

21088388462806 is a wasteful number, since it uses less digits than its factorization.

21088388462806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444212619.

The product of its (nonzero) digits is 56623104, while the sum is 64.

The spelling of 21088388462806 in words is "twenty-one trillion, eighty-eight billion, three hundred eighty-eight million, four hundred sixty-two thousand, eight hundred six".