21406514248 has 64 divisors (see below), whose sum is σ = 46431964800. Its totient is φ = 9062254080.

The previous prime is 21406514237. The next prime is 21406514279. The reversal of 21406514248 is 84241560412.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8675911 + ... + 8678377.

It is an arithmetic number, because the mean of its divisors is an integer number (725499450).

Almost surely, 2^21406514248 is an apocalyptic number.

21406514248 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21406514248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23215982400).

21406514248 is an abundant number, since it is smaller than the sum of its proper divisors (25025450552).

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

21406514248 is a wasteful number, since it uses less digits than its factorization.

21406514248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4310 (or 4306 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 37.

The spelling of 21406514248 in words is "twenty-one billion, four hundred six million, five hundred fourteen thousand, two hundred forty-eight".