21245854432 has 96 divisors (see below), whose sum is σ = 46704397824. Its totient is φ = 9430809600.

The previous prime is 21245854417. The next prime is 21245854451. The reversal of 21245854432 is 23445854212.

It is a congruent number.

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, 9313132 + ... + 9315412.

It is an arithmetic number, because the mean of its divisors is an integer number (486504144).

Almost surely, 2^21245854432 is an apocalyptic number.

21245854432 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21245854432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23352198912).

21245854432 is an abundant number, since it is smaller than the sum of its proper divisors (25458543392).

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

21245854432 is a wasteful number, since it uses less digits than its factorization.

21245854432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2912 (or 2904 counting only the distinct ones).

The product of its digits is 307200, while the sum is 40.

The spelling of 21245854432 in words is "twenty-one billion, two hundred forty-five million, eight hundred fifty-four thousand, four hundred thirty-two".