21975501416 has 64 divisors (see below), whose sum is σ = 45576864000. Its totient is φ = 9849864960.

The previous prime is 21975501397. The next prime is 21975501421. The reversal of 21975501416 is 61410557912.

It is a happy number.

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, 7430210 + ... + 7433166.

It is an arithmetic number, because the mean of its divisors is an integer number (712138500).

Almost surely, 2^21975501416 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 21975501416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22788432000).

21975501416 is an abundant number, since it is smaller than the sum of its proper divisors (23601362584).

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

21975501416 is a wasteful number, since it uses less digits than its factorization.

21975501416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4122 (or 4118 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 41.

The spelling of 21975501416 in words is "twenty-one billion, nine hundred seventy-five million, five hundred one thousand, four hundred sixteen".