21432066453 has 20 divisors (see below), whose sum is σ = 36589490080. Its totient is φ = 12246894792.

The previous prime is 21432066451. The next prime is 21432066503. The reversal of 21432066453 is 35466023412.

21432066453 is a `hidden beast` number, since 2 + 1 + 4 + 3 + 2 + 0 + 6 + 645 + 3 = 666.

It is not a de Polignac number, because 21432066453 - 2¹ = 21432066451 is a prime.

It is a super-3 number, since 3×21432066453³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432066451) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18898963 + ... + 18900096.

It is an arithmetic number, because the mean of its divisors is an integer number (1829474504).

Almost surely, 2^21432066453 is an apocalyptic number.

It is an amenable number.

21432066453 is a deficient number, since it is larger than the sum of its proper divisors (15157423627).

21432066453 is an equidigital number, since it uses as much as digits as its factorization.

21432066453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37799078 (or 37799069 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

Adding to 21432066453 its reverse (35466023412), we get a palindrome (56898089865).

The spelling of 21432066453 in words is "twenty-one billion, four hundred thirty-two million, sixty-six thousand, four hundred fifty-three".