21415328104 has 8 divisors (see below), whose sum is σ = 40153740210. Its totient is φ = 10707664048.

The previous prime is 21415328063. The next prime is 21415328119. The reversal of 21415328104 is 40182351412.

It can be written as a sum of positive squares in only one way, i.e., 12342765604 + 9072562500 = 111098^2 + 95250^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1338457999 + ... + 1338458014.

Almost surely, 2^21415328104 is an apocalyptic number.

It is an amenable number.

21415328104 is a deficient number, since it is larger than the sum of its proper divisors (18738412106).

21415328104 is a wasteful number, since it uses less digits than its factorization.

21415328104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2676916019 (or 2676916015 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

Adding to 21415328104 its reverse (40182351412), we get a palindrome (61597679516).

The spelling of 21415328104 in words is "twenty-one billion, four hundred fifteen million, three hundred twenty-eight thousand, one hundred four".