21004413422432 has 96 divisors (see below), whose sum is σ = 45311613871104. Its totient is φ = 9505227916800.

The previous prime is 21004413422351. The next prime is 21004413422449. The reversal of 21004413422432 is 23422431440012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

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, 102105023 + ... + 102310529.

It is an arithmetic number, because the mean of its divisors is an integer number (471995977824).

Almost surely, 2^{21004413422432} is an apocalyptic number.

21004413422432 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 21004413422432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22655806935552).

21004413422432 is an abundant number, since it is smaller than the sum of its proper divisors (24307200448672).

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

21004413422432 is a wasteful number, since it uses less digits than its factorization.

21004413422432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206812 (or 206804 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 32.

Adding to 21004413422432 its reverse (23422431440012), we get a palindrome (44426844862444).

The spelling of 21004413422432 in words is "twenty-one trillion, four billion, four hundred thirteen million, four hundred twenty-two thousand, four hundred thirty-two".