21234032444 has 24 divisors (see below), whose sum is σ = 40260428208. Its totient is φ = 9760101120.

The previous prime is 21234032431. The next prime is 21234032497. The reversal of 21234032444 is 44423043212.

It is a super-2 number, since 2×21234032444² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3628067 + ... + 3633914.

It is an arithmetic number, because the mean of its divisors is an integer number (1677517842).

Almost surely, 2^21234032444 is an apocalyptic number.

It is an amenable number.

21234032444 is a deficient number, since it is larger than the sum of its proper divisors (19026395764).

21234032444 is a wasteful number, since it uses less digits than its factorization.

21234032444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7262045 (or 7262043 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 21234032444 its reverse (44423043212), we get a palindrome (65657075656).

The spelling of 21234032444 in words is "twenty-one billion, two hundred thirty-four million, thirty-two thousand, four hundred forty-four".