21453766633548 has 72 divisors (see below), whose sum is σ = 57085438191600. Its totient is φ = 6774772265856.

The previous prime is 21453766633531. The next prime is 21453766633601. The reversal of 21453766633548 is 84533666735412.

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 in 23 ways as a sum of consecutive naturals, for example, 54983190 + ... + 55372002.

Almost surely, 2^{21453766633548} is an apocalyptic number.

It is an amenable number.

21453766633548 is an abundant number, since it is smaller than the sum of its proper divisors (35631671558052).

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

21453766633548 is a wasteful number, since it uses less digits than its factorization.

21453766633548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469511 (or 469506 counting only the distinct ones).

The product of its digits is 261273600, while the sum is 63.

The spelling of 21453766633548 in words is "twenty-one trillion, four hundred fifty-three billion, seven hundred sixty-six million, six hundred thirty-three thousand, five hundred forty-eight".