21316591848 has 128 divisors (see below), whose sum is σ = 55814400000. Its totient is φ = 6777872640.

The previous prime is 21316591837. The next prime is 21316591859. The reversal of 21316591848 is 84819561312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21316591837) and next prime (21316591859).

It is a junction number, because it is equal to n+sod(n) for n = 21316591797 and 21316591806.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12545703 + ... + 12547401.

It is an arithmetic number, because the mean of its divisors is an integer number (436050000).

Almost surely, 2^21316591848 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21316591848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27907200000).

21316591848 is an abundant number, since it is smaller than the sum of its proper divisors (34497808152).

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

21316591848 is a wasteful number, since it uses less digits than its factorization.

21316591848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2015 (or 2011 counting only the distinct ones).

The product of its digits is 414720, while the sum is 48.

The spelling of 21316591848 in words is "twenty-one billion, three hundred sixteen million, five hundred ninety-one thousand, eight hundred forty-eight".