21320104440004 has 24 divisors (see below), whose sum is σ = 37591751038968. Its totient is φ = 10579642368000.

The previous prime is 21320104439999. The next prime is 21320104440023. The reversal of 21320104440004 is 40004440102312.

It can be written as a sum of positive squares in 4 ways, for example, as 16322617600 + 21303781822404 = 127760^2 + 4615602^2 .

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, 2543997 + ... + 7008004.

It is an arithmetic number, because the mean of its divisors is an integer number (1566322959957).

Almost surely, 2^{21320104440004} is an apocalyptic number.

It is an amenable number.

21320104440004 is a deficient number, since it is larger than the sum of its proper divisors (16271646598964).

21320104440004 is a wasteful number, since it uses less digits than its factorization.

21320104440004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9556215 (or 9556213 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21320104440004 its reverse (40004440102312), we get a palindrome (61324544542316).

The spelling of 21320104440004 in words is "twenty-one trillion, three hundred twenty billion, one hundred four million, four hundred forty thousand, four".