21454134530 has 32 divisors (see below), whose sum is σ = 38872452528. Its totient is φ = 8525088000.

The previous prime is 21454134439. The next prime is 21454134553. The reversal of 21454134530 is 3543145412.

It can be written as a sum of positive squares in 8 ways, for example, as 503598481 + 20950536049 = 22441^2 + 144743^2 .

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1827680 + ... + 1839380.

Almost surely, 2^21454134530 is an apocalyptic number.

21454134530 is a deficient number, since it is larger than the sum of its proper divisors (17418317998).

21454134530 is a wasteful number, since it uses less digits than its factorization.

21454134530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12902.

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 21454134530 its reverse (3543145412), we get a palindrome (24997279942).

The spelling of 21454134530 in words is "twenty-one billion, four hundred fifty-four million, one hundred thirty-four thousand, five hundred thirty".