21384853672 has 64 divisors (see below), whose sum is σ = 49645451520. Its totient is φ = 8409235968.

The previous prime is 21384853667. The next prime is 21384853687. The reversal of 21384853672 is 27635848312.

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, 33628 + ... + 209524.

It is an arithmetic number, because the mean of its divisors is an integer number (775710180).

Almost surely, 2^21384853672 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 21384853672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24822725760).

21384853672 is an abundant number, since it is smaller than the sum of its proper divisors (28260597848).

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

21384853672 is a wasteful number, since it uses less digits than its factorization.

21384853672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176090 (or 176086 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 49.

The spelling of 21384853672 in words is "twenty-one billion, three hundred eighty-four million, eight hundred fifty-three thousand, six hundred seventy-two".