21474836480 has 66 divisors (see below), whose sum is σ = 51539607546. Its totient is φ = 8589934592.

The previous prime is 21474836479. The next prime is 21474836483. The reversal of 21474836480 is 8463847412.

It can be written as a sum of positive squares in only one way, i.e., 17179869184 + 4294967296 = 131072^2 + 65536^2 .

It is a super-2 number, since 2×21474836480² (a number of 21 digits) contains 22 as substring.

It is a nialpdrome in base 4 and base 16.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21474836483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (2) of ones.

In principle, a polygon with 21474836480 sides can be constructed with ruler and compass.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4294967294 + ... + 4294967298.

Almost surely, 2^21474836480 is an apocalyptic number.

21474836480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21474836480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25769803773).

21474836480 is an abundant number, since it is smaller than the sum of its proper divisors (30064771066).

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

21474836480 is an frugal number, since it uses more digits than its factorization.

21474836480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69 (or 7 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 47.

The spelling of 21474836480 in words is "twenty-one billion, four hundred seventy-four million, eight hundred thirty-six thousand, four hundred eighty".