21034002444 has 144 divisors (see below), whose sum is σ = 62527449600. Its totient is φ = 5453288064.

The previous prime is 21034002439. The next prime is 21034002559. The reversal of 21034002444 is 44420043012.

It is a happy number.

It is a super-3 number, since 3×21034002444³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 427677 + ... + 474315.

It is an arithmetic number, because the mean of its divisors is an integer number (434218400).

Almost surely, 2^21034002444 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 21034002444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31263724800).

21034002444 is an abundant number, since it is smaller than the sum of its proper divisors (41493447156).

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

21034002444 is a wasteful number, since it uses less digits than its factorization.

21034002444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46732 (or 46723 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21034002444 its reverse (44420043012), we get a palindrome (65454045456).

The spelling of 21034002444 in words is "twenty-one billion, thirty-four million, two thousand, four hundred forty-four".