21361482816 has 56 divisors (see below), whose sum is σ = 57897454944. Its totient is φ = 6946821120.

The previous prime is 21361482803. The next prime is 21361482827. The reversal of 21361482816 is 61828416312.

It is a happy number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1348930 + ... + 1364673.

It is an arithmetic number, because the mean of its divisors is an integer number (1033883124).

Almost surely, 2^21361482816 is an apocalyptic number.

It is an amenable number.

21361482816 is an abundant number, since it is smaller than the sum of its proper divisors (36535972128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21361482816 is a wasteful number, since it uses less digits than its factorization.

21361482816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2713659 (or 2713649 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The spelling of 21361482816 in words is "twenty-one billion, three hundred sixty-one million, four hundred eighty-two thousand, eight hundred sixteen".