21450432401504 has 12 divisors (see below), whose sum is σ = 42230538790524. Its totient is φ = 10725216200736.

The previous prime is 21450432401479. The next prime is 21450432401513. The reversal of 21450432401504 is 40510423405412.

It is a happy number.

It is a super-2 number, since 2×21450432401504² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335163006242 + ... + 335163006305.

It is an arithmetic number, because the mean of its divisors is an integer number (3519211565877).

Almost surely, 2^{21450432401504} is an apocalyptic number.

It is an amenable number.

21450432401504 is a deficient number, since it is larger than the sum of its proper divisors (20780106389020).

21450432401504 is an equidigital number, since it uses as much as digits as its factorization.

21450432401504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670326012557 (or 670326012549 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 35.

Adding to 21450432401504 its reverse (40510423405412), we get a palindrome (61960855806916).

The spelling of 21450432401504 in words is "twenty-one trillion, four hundred fifty billion, four hundred thirty-two million, four hundred one thousand, five hundred four".