21326543504 has 60 divisors (see below), whose sum is σ = 48347280576. Its totient is φ = 8927303616.

The previous prime is 21326543471. The next prime is 21326543507. The reversal of 21326543504 is 40534562312.

It is not an unprimeable number, because it can be changed into a prime (21326543507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 155597 + ... + 258579.

Almost surely, 2^21326543504 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 21326543504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24173640288).

21326543504 is an abundant number, since it is smaller than the sum of its proper divisors (27020737072).

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

21326543504 is a wasteful number, since it uses less digits than its factorization.

21326543504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103084 (or 103035 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 35.

The spelling of 21326543504 in words is "twenty-one billion, three hundred twenty-six million, five hundred forty-three thousand, five hundred four".