21044034144 has 192 divisors, whose sum is σ = 71471393280. Its totient is φ = 5899046400.

The previous prime is 21044034139. The next prime is 21044034169. The reversal of 21044034144 is 44143044012.

21044034144 is a `hidden beast` number, since 210 + 4 + 403 + 4 + 1 + 44 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 287719 + ... + 353369.

It is an arithmetic number, because the mean of its divisors is an integer number (372246840).

Almost surely, 2^21044034144 is an apocalyptic number.

21044034144 is a gapful number since it is divisible by the number (24) 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 21044034144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35735696640).

21044034144 is an abundant number, since it is smaller than the sum of its proper divisors (50427359136).

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

21044034144 is a wasteful number, since it uses less digits than its factorization.

21044034144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65730 (or 65716 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 21044034144 its reverse (44143044012), we get a palindrome (65187078156).

The spelling of 21044034144 in words is "twenty-one billion, forty-four million, thirty-four thousand, one hundred forty-four".