21308526316 has 72 divisors (see below), whose sum is σ = 47853666000. Its totient is φ = 8208668160.

The previous prime is 21308526311. The next prime is 21308526331. The reversal of 21308526316 is 61362580312.

It is not an unprimeable number, because it can be changed into a prime (21308526311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 136360 + ... + 247408.

It is an arithmetic number, because the mean of its divisors is an integer number (664634250).

Almost surely, 2^21308526316 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 21308526316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23926833000).

21308526316 is an abundant number, since it is smaller than the sum of its proper divisors (26545139684).

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

21308526316 is a wasteful number, since it uses less digits than its factorization.

21308526316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111167 (or 111158 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 21308526316 in words is "twenty-one billion, three hundred eight million, five hundred twenty-six thousand, three hundred sixteen".