21044442404 has 6 divisors (see below), whose sum is σ = 36827774214. Its totient is φ = 10522221200.

The previous prime is 21044442361. The next prime is 21044442421. The reversal of 21044442404 is 40424444012.

It can be written as a sum of positive squares in only one way, i.e., 13213962304 + 7830480100 = 114952^2 + 88490^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2630555297 + ... + 2630555304.

It is an arithmetic number, because the mean of its divisors is an integer number (6137962369).

Almost surely, 2^21044442404 is an apocalyptic number.

It is an amenable number.

21044442404 is a deficient number, since it is larger than the sum of its proper divisors (15783331810).

21044442404 is a wasteful number, since it uses less digits than its factorization.

21044442404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5261110605 (or 5261110603 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 29.

Adding to 21044442404 its reverse (40424444012), we get a palindrome (61468886416).

The spelling of 21044442404 in words is "twenty-one billion, forty-four million, four hundred forty-two thousand, four hundred four".