21350038016 has 120 divisors (see below), whose sum is σ = 44700516960. Its totient is φ = 10181670912.

The previous prime is 21350038007. The next prime is 21350038019. The reversal of 21350038016 is 61083005312.

It is a self number, because there is not a number n which added to its sum of digits gives 21350038016.

It is not an unprimeable number, because it can be changed into a prime (21350038019) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48633125 + ... + 48633563.

It is an arithmetic number, because the mean of its divisors is an integer number (372504308).

Almost surely, 2^21350038016 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 21350038016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22350258480).

21350038016 is an abundant number, since it is smaller than the sum of its proper divisors (23350478944).

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

21350038016 is an frugal number, since it uses more digits than its factorization.

21350038016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594 (or 531 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 21350038016 in words is "twenty-one billion, three hundred fifty million, thirty-eight thousand, sixteen".