21120311012 has 12 divisors (see below), whose sum is σ = 39134694060. Its totient is φ = 9938969856.

The previous prime is 21120310997. The next prime is 21120311033. The reversal of 21120311012 is 21011302112.

It can be written as a sum of positive squares in 2 ways, for example, as 17866064896 + 3254246116 = 133664^2 + 57046^2 .

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, 155296337 + ... + 155296472.

It is an arithmetic number, because the mean of its divisors is an integer number (3261224505).

Almost surely, 2^21120311012 is an apocalyptic number.

It is an amenable number.

21120311012 is a deficient number, since it is larger than the sum of its proper divisors (18014383048).

21120311012 is a wasteful number, since it uses less digits than its factorization.

21120311012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310592830 (or 310592828 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21120311012 its reverse (21011302112), we get a palindrome (42131613124).

The spelling of 21120311012 in words is "twenty-one billion, one hundred twenty million, three hundred eleven thousand, twelve".