21124103312 has 40 divisors (see below), whose sum is σ = 45151302840. Its totient is φ = 9511787520.

The previous prime is 21124103303. The next prime is 21124103323. The reversal of 21124103312 is 21330142112.

It can be written as a sum of positive squares in 4 ways, for example, as 375429376 + 20748673936 = 19376^2 + 144044^2 .

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, 1229987 + ... + 1247042.

It is an arithmetic number, because the mean of its divisors is an integer number (1128782571).

Almost surely, 2^21124103312 is an apocalyptic number.

It is an amenable number.

21124103312 is an abundant number, since it is smaller than the sum of its proper divisors (24027199528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21124103312 is a wasteful number, since it uses less digits than its factorization.

21124103312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2477091 (or 2477085 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21124103312 its reverse (21330142112), we get a palindrome (42454245424).

The spelling of 21124103312 in words is "twenty-one billion, one hundred twenty-four million, one hundred three thousand, three hundred twelve".