21000541324 has 48 divisors (see below), whose sum is σ = 42982732800. Its totient is φ = 8974091280.

The previous prime is 21000541319. The next prime is 21000541381. The reversal of 21000541324 is 42314500012.

It is a junction number, because it is equal to n+sod(n) for n = 21000541295 and 21000541304.

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, 454029 + ... + 498139.

It is an arithmetic number, because the mean of its divisors is an integer number (895473600).

Almost surely, 2^21000541324 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 21000541324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21491366400).

21000541324 is an abundant number, since it is smaller than the sum of its proper divisors (21982191476).

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

21000541324 is a wasteful number, since it uses less digits than its factorization.

21000541324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44483 (or 44467 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The spelling of 21000541324 in words is "twenty-one billion, five hundred forty-one thousand, three hundred twenty-four".