21342000444 has 12 divisors (see below), whose sum is σ = 49798001064. Its totient is φ = 7114000144.

The previous prime is 21342000419. The next prime is 21342000457. The reversal of 21342000444 is 44400024312.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 889250007 + ... + 889250030.

It is an arithmetic number, because the mean of its divisors is an integer number (4149833422).

Almost surely, 2^21342000444 is an apocalyptic number.

It is an amenable number.

21342000444 is an abundant number, since it is smaller than the sum of its proper divisors (28456000620).

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

21342000444 is a wasteful number, since it uses less digits than its factorization.

21342000444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1778500044 (or 1778500042 counting only the distinct ones).

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

Adding to 21342000444 its reverse (44400024312), we get a palindrome (65742024756).

The spelling of 21342000444 in words is "twenty-one billion, three hundred forty-two million, four hundred forty-four", and thus it is an aban number.