21814837056 has 168 divisors, whose sum is σ = 66354191904. Its totient is φ = 7102287360.

The previous prime is 21814837049. The next prime is 21814837073. The reversal of 21814837056 is 65073841812.

21814837056 is a `hidden beast` number, since 21 + 81 + 483 + 70 + 5 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 652426 + ... + 685046.

It is an arithmetic number, because the mean of its divisors is an integer number (394965428).

Almost surely, 2^21814837056 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 21814837056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33177095952).

21814837056 is an abundant number, since it is smaller than the sum of its proper divisors (44539354848).

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

21814837056 is an equidigital number, since it uses as much as digits as its factorization.

21814837056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32691 (or 32669 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 21814837056 in words is "twenty-one billion, eight hundred fourteen million, eight hundred thirty-seven thousand, fifty-six".