21451241453504 has 14 divisors (see below), whose sum is σ = 42567307259424. Its totient is φ = 10725620726720.

The previous prime is 21451241453489. The next prime is 21451241453557. The reversal of 21451241453504 is 40535414215412.

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, 167587823792 + ... + 167587823919.

Almost surely, 2^{21451241453504} is an apocalyptic number.

It is an amenable number.

21451241453504 is a deficient number, since it is larger than the sum of its proper divisors (21116065805920).

21451241453504 is an equidigital number, since it uses as much as digits as its factorization.

21451241453504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335175647723 (or 335175647713 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 41.

Adding to 21451241453504 its reverse (40535414215412), we get a palindrome (61986655668916).

The spelling of 21451241453504 in words is "twenty-one trillion, four hundred fifty-one billion, two hundred forty-one million, four hundred fifty-three thousand, five hundred four".