21284344776 has 32 divisors (see below), whose sum is σ = 53258312160. Its totient is φ = 7088454912.

The previous prime is 21284344771. The next prime is 21284344793. The reversal of 21284344776 is 67744348212.

It is not an unprimeable number, because it can be changed into a prime (21284344771) by changing a digit.

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, 367905 + ... + 421808.

It is an arithmetic number, because the mean of its divisors is an integer number (1664322255).

Almost surely, 2^21284344776 is an apocalyptic number.

It is an amenable number.

21284344776 is an abundant number, since it is smaller than the sum of its proper divisors (31973967384).

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

21284344776 is a wasteful number, since it uses less digits than its factorization.

21284344776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790845 (or 790841 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 48.

The spelling of 21284344776 in words is "twenty-one billion, two hundred eighty-four million, three hundred forty-four thousand, seven hundred seventy-six".