21534502416 has 160 divisors (see below), whose sum is σ = 67014758400. Its totient is φ = 5821009920.

The previous prime is 21534502393. The next prime is 21534502427. The reversal of 21534502416 is 61420543512.

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, 5928921 + ... + 5932551.

It is an arithmetic number, because the mean of its divisors is an integer number (418842240).

Almost surely, 2^21534502416 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 21534502416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33507379200).

21534502416 is an abundant number, since it is smaller than the sum of its proper divisors (45480255984).

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

21534502416 is a wasteful number, since it uses less digits than its factorization.

21534502416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4597 (or 4591 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The spelling of 21534502416 in words is "twenty-one billion, five hundred thirty-four million, five hundred two thousand, four hundred sixteen".