21470454784 has 99 divisors (see below), whose sum is σ = 45486515961. Its totient is φ = 10128015360.

The previous prime is 21470454779. The next prime is 21470454791. The reversal of 21470454784 is 48745407412.

The square root of 21470454784 is 146528.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 16147293184 + 5323161600 = 127072^2 + 72960^2 .

It is a Duffinian number.

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 8 ways as a sum of consecutive naturals, for example, 89088904 + ... + 89089144.

Almost surely, 2^21470454784 is an apocalyptic number.

21470454784 is the 146528-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21470454784

21470454784 is an abundant number, since it is smaller than the sum of its proper divisors (24016061177).

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

21470454784 is an frugal number, since it uses more digits than its factorization.

21470454784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540 (or 262 counting only the distinct ones).

The product of its (nonzero) digits is 1003520, while the sum is 46.

The spelling of 21470454784 in words is "twenty-one billion, four hundred seventy million, four hundred fifty-four thousand, seven hundred eighty-four".