21480035944 has 16 divisors (see below), whose sum is σ = 41363583300. Its totient is φ = 10449747072.

The previous prime is 21480035903. The next prime is 21480035947. The reversal of 21480035944 is 44953008412.

It can be written as a sum of positive squares in 2 ways, for example, as 21389062500 + 90973444 = 146250^2 + 9538^2 .

It is a super-2 number, since 2×21480035944² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21480035897 and 21480035906.

It is not an unprimeable number, because it can be changed into a prime (21480035947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36283549 + ... + 36284140.

Almost surely, 2^21480035944 is an apocalyptic number.

It is an amenable number.

21480035944 is a deficient number, since it is larger than the sum of its proper divisors (19883547356).

21480035944 is a wasteful number, since it uses less digits than its factorization.

21480035944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72567732 (or 72567728 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 21480035944 in words is "twenty-one billion, four hundred eighty million, thirty-five thousand, nine hundred forty-four".