21104113252 has 12 divisors (see below), whose sum is σ = 37347167340. Its totient is φ = 10433494016.

The previous prime is 21104113237. The next prime is 21104113271. The reversal of 21104113252 is 25231140112.

It can be written as a sum of positive squares in 2 ways, for example, as 2492605476 + 18611507776 = 49926^2 + 136424^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29640253 + ... + 29640964.

It is an arithmetic number, because the mean of its divisors is an integer number (3112263945).

Almost surely, 2^21104113252 is an apocalyptic number.

It is an amenable number.

21104113252 is a deficient number, since it is larger than the sum of its proper divisors (16243054088).

21104113252 is a wasteful number, since it uses less digits than its factorization.

21104113252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59281310 (or 59281308 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 21104113252 its reverse (25231140112), we get a palindrome (46335253364).

The spelling of 21104113252 in words is "twenty-one billion, one hundred four million, one hundred thirteen thousand, two hundred fifty-two".