21521412530432 has 72 divisors (see below), whose sum is σ = 43960475771520. Its totient is φ = 10509817006080.

The previous prime is 21521412530413. The next prime is 21521412530531. The reversal of 21521412530432 is 23403521412512.

It is a super-2 number, since 2×21521412530432² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21521412530392 and 21521412530401.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216378569 + ... + 216478007.

Almost surely, 2^{21521412530432} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21521412530432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21980237885760).

21521412530432 is an abundant number, since it is smaller than the sum of its proper divisors (22439063241088).

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

21521412530432 is an equidigital number, since it uses as much as digits as its factorization.

21521412530432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119159 (or 119145 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 21521412530432 its reverse (23403521412512), we get a palindrome (44924933942944).

The spelling of 21521412530432 in words is "twenty-one trillion, five hundred twenty-one billion, four hundred twelve million, five hundred thirty thousand, four hundred thirty-two".