21152984244 has 96 divisors (see below), whose sum is σ = 57767136000. Its totient is φ = 6021872640.

The previous prime is 21152984239. The next prime is 21152984257. The reversal of 21152984244 is 44248925112.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 21152984196 and 21152984205.

It is a congruent number.

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, 1147452 + ... + 1165740.

It is an arithmetic number, because the mean of its divisors is an integer number (601741000).

Almost surely, 2^21152984244 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 21152984244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28883568000).

21152984244 is an abundant number, since it is smaller than the sum of its proper divisors (36614151756).

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

21152984244 is a wasteful number, since it uses less digits than its factorization.

21152984244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18598 (or 18582 counting only the distinct ones).

The product of its digits is 184320, while the sum is 42.

The spelling of 21152984244 in words is "twenty-one billion, one hundred fifty-two million, nine hundred eighty-four thousand, two hundred forty-four".