21248440244663 has 8 divisors (see below), whose sum is σ = 21267839972736. Its totient is φ = 21229047993400.

The previous prime is 21248440244623. The next prime is 21248440244671. The reversal of 21248440244663 is 36644204484212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21248440244663 - 2⁶ = 21248440244599 is a prime.

It is a super-2 number, since 2×21248440244663² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21248440244623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3825128 + ... + 7558338.

It is an arithmetic number, because the mean of its divisors is an integer number (2658479996592).

Almost surely, 2^{21248440244663} is an apocalyptic number.

21248440244663 is a deficient number, since it is larger than the sum of its proper divisors (19399728073).

21248440244663 is a wasteful number, since it uses less digits than its factorization.

21248440244663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3738405.

The product of its (nonzero) digits is 7077888, while the sum is 50.

The spelling of 21248440244663 in words is "twenty-one trillion, two hundred forty-eight billion, four hundred forty million, two hundred forty-four thousand, six hundred sixty-three".