21900543016 has 64 divisors (see below), whose sum is σ = 46042940160. Its totient is φ = 9678240000.

The previous prime is 21900542971. The next prime is 21900543019. The reversal of 21900543016 is 61034500912.

It is not an unprimeable number, because it can be changed into a prime (21900543019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7653426 + ... + 7656286.

It is an arithmetic number, because the mean of its divisors is an integer number (719420940).

Almost surely, 2^21900543016 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 21900543016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23021470080).

21900543016 is an abundant number, since it is smaller than the sum of its proper divisors (24142397144).

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

21900543016 is a wasteful number, since it uses less digits than its factorization.

21900543016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5266 (or 5262 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The spelling of 21900543016 in words is "twenty-one billion, nine hundred million, five hundred forty-three thousand, sixteen".