21452320420504 has 32 divisors (see below), whose sum is σ = 42340400308800. Its totient is φ = 10161554850720.

The previous prime is 21452320420411. The next prime is 21452320420513. The reversal of 21452320420504 is 40502402325412.

It is a super-2 number, since 2×21452320420504² (a number of 27 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 21452320420504.

It is a congruent number.

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, 26229319 + ... + 27034825.

It is an arithmetic number, because the mean of its divisors is an integer number (1323137509650).

Almost surely, 2^{21452320420504} is an apocalyptic number.

It is an amenable number.

21452320420504 is a deficient number, since it is larger than the sum of its proper divisors (20888079888296).

21452320420504 is a wasteful number, since it uses less digits than its factorization.

21452320420504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980743 (or 980739 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 34.

Adding to 21452320420504 its reverse (40502402325412), we get a palindrome (61954722745916).

The spelling of 21452320420504 in words is "twenty-one trillion, four hundred fifty-two billion, three hundred twenty million, four hundred twenty thousand, five hundred four".