21530454435 has 96 divisors (see below), whose sum is σ = 44080702848. Its totient is φ = 9516810240.

The previous prime is 21530454391. The next prime is 21530454469. The reversal of 21530454435 is 53445403512.

21530454435 is a `hidden beast` number, since 215 + 3 + 0 + 4 + 5 + 4 + 435 = 666.

It is not a de Polignac number, because 21530454435 - 2¹⁰ = 21530453411 is a prime.

It is a super-2 number, since 2×21530454435² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21530454435.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1452019 + ... + 1466771.

It is an arithmetic number, because the mean of its divisors is an integer number (459173988).

Almost surely, 2^21530454435 is an apocalyptic number.

21530454435 is an abundant number, since it is smaller than the sum of its proper divisors (22550248413).

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

21530454435 is a wasteful number, since it uses less digits than its factorization.

21530454435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14925 (or 14922 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 36.

Adding to 21530454435 its reverse (53445403512), we get a palindrome (74975857947).

The spelling of 21530454435 in words is "twenty-one billion, five hundred thirty million, four hundred fifty-four thousand, four hundred thirty-five".