21230413452 has 18 divisors (see below), whose sum is σ = 53665767428. Its totient is φ = 7076804472.

The previous prime is 21230413447. The next prime is 21230413489. The reversal of 21230413452 is 25431403212.

21230413452 is a `hidden beast` number, since 2 + 12 + 304 + 1 + 345 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 294866818 + ... + 294866889.

Almost surely, 2^21230413452 is an apocalyptic number.

It is an amenable number.

21230413452 is an abundant number, since it is smaller than the sum of its proper divisors (32435353976).

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

21230413452 is a wasteful number, since it uses less digits than its factorization.

21230413452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589733717 (or 589733712 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 21230413452 its reverse (25431403212), we get a palindrome (46661816664).

The spelling of 21230413452 in words is "twenty-one billion, two hundred thirty million, four hundred thirteen thousand, four hundred fifty-two".