21502444044304 has 10 divisors (see below), whose sum is σ = 41660985335870. Its totient is φ = 10751222022144.

The previous prime is 21502444044181. The next prime is 21502444044311. The reversal of 21502444044304 is 40344044420512.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 14488315547904 + 7014128496400 = 3806352^2 + 2648420^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 671951376369 + ... + 671951376400.

It is an arithmetic number, because the mean of its divisors is an integer number (4166098533587).

Almost surely, 2^{21502444044304} is an apocalyptic number.

It is an amenable number.

21502444044304 is a deficient number, since it is larger than the sum of its proper divisors (20158541291566).

21502444044304 is a wasteful number, since it uses less digits than its factorization.

21502444044304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343902752777 (or 1343902752771 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 37.

Adding to 21502444044304 its reverse (40344044420512), we get a palindrome (61846488464816).

The spelling of 21502444044304 in words is "twenty-one trillion, five hundred two billion, four hundred forty-four million, forty-four thousand, three hundred four".