21112638352 has 80 divisors (see below), whose sum is σ = 45414593280. Its totient is φ = 9447515136.

The previous prime is 21112638343. The next prime is 21112638383. The reversal of 21112638352 is 25383621112.

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, 884073 + ... + 907639.

It is an arithmetic number, because the mean of its divisors is an integer number (567682416).

Almost surely, 2^21112638352 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 21112638352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22707296640).

21112638352 is an abundant number, since it is smaller than the sum of its proper divisors (24301954928).

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

21112638352 is a wasteful number, since it uses less digits than its factorization.

21112638352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23720 (or 23714 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The spelling of 21112638352 in words is "twenty-one billion, one hundred twelve million, six hundred thirty-eight thousand, three hundred fifty-two".