21034344444 has 12 divisors (see below), whose sum is σ = 49080137064. Its totient is φ = 7011448144.

The previous prime is 21034344437. The next prime is 21034344449. The reversal of 21034344444 is 44444343012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034344449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 876431007 + ... + 876431030.

It is an arithmetic number, because the mean of its divisors is an integer number (4090011422).

Almost surely, 2^21034344444 is an apocalyptic number.

It is an amenable number.

21034344444 is an abundant number, since it is smaller than the sum of its proper divisors (28045792620).

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

21034344444 is a wasteful number, since it uses less digits than its factorization.

21034344444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1752862044 (or 1752862042 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 33.

Adding to 21034344444 its reverse (44444343012), we get a palindrome (65478687456).

The spelling of 21034344444 in words is "twenty-one billion, thirty-four million, three hundred forty-four thousand, four hundred forty-four".