21120011012 has 24 divisors (see below), whose sum is σ = 37415117376. Its totient is φ = 10430044448.

The previous prime is 21120010963. The next prime is 21120011023. The reversal of 21120011012 is 21011002112.

It is a junction number, because it is equal to n+sod(n) for n = 21120010984 and 21120011002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1962398 + ... + 1973130.

It is an arithmetic number, because the mean of its divisors is an integer number (1558963224).

Almost surely, 2^21120011012 is an apocalyptic number.

It is an amenable number.

21120011012 is a deficient number, since it is larger than the sum of its proper divisors (16295106364).

21120011012 is a wasteful number, since it uses less digits than its factorization.

21120011012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16747 (or 16745 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21120011012 its reverse (21011002112), we get a palindrome (42131013124).

The spelling of 21120011012 in words is "twenty-one billion, one hundred twenty million, eleven thousand, twelve".