21409517748448 has 24 divisors (see below), whose sum is σ = 42559211258928. Its totient is φ = 10600829174784.

The previous prime is 21409517748361. The next prime is 21409517748461. The reversal of 21409517748448 is 84484771590412.

It is a super-2 number, since 2×21409517748448² (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 21409517748448.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3247799761 + ... + 3247806352.

It is an arithmetic number, because the mean of its divisors is an integer number (1773300469122).

Almost surely, 2^{21409517748448} is an apocalyptic number.

It is an amenable number.

21409517748448 is a deficient number, since it is larger than the sum of its proper divisors (21149693510480).

21409517748448 is a wasteful number, since it uses less digits than its factorization.

21409517748448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6495606226 (or 6495606218 counting only the distinct ones).

The product of its (nonzero) digits is 72253440, while the sum is 64.

The spelling of 21409517748448 in words is "twenty-one trillion, four hundred nine billion, five hundred seventeen million, seven hundred forty-eight thousand, four hundred forty-eight".