21231103312 has 20 divisors (see below), whose sum is σ = 41138941716. Its totient is φ = 10614602240.

The previous prime is 21231103303. The next prime is 21231103337. The reversal of 21231103312 is 21330113212.

It can be written as a sum of positive squares in 2 ways, for example, as 4861436176 + 16369667136 = 69724^2 + 127944^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21231103312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146862 + ... + 253042.

Almost surely, 2^21231103312 is an apocalyptic number.

It is an amenable number.

21231103312 is a deficient number, since it is larger than the sum of its proper divisors (19907838404).

21231103312 is a wasteful number, since it uses less digits than its factorization.

21231103312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118686 (or 118680 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21231103312 its reverse (21330113212), we get a palindrome (42561216524).

The spelling of 21231103312 in words is "twenty-one billion, two hundred thirty-one million, one hundred three thousand, three hundred twelve".