21011102012 has 12 divisors (see below), whose sum is σ = 36792667296. Its totient is φ = 10498911360.

The previous prime is 21011101999. The next prime is 21011102017. The reversal of 21011102012 is 21020111012.

It is a junction number, because it is equal to n+sod(n) for n = 21011101984 and 21011102002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011102017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1652789 + ... + 1665452.

It is an arithmetic number, because the mean of its divisors is an integer number (3066055608).

Almost surely, 2^21011102012 is an apocalyptic number.

It is an amenable number.

21011102012 is a deficient number, since it is larger than the sum of its proper divisors (15781565284).

21011102012 is a wasteful number, since it uses less digits than its factorization.

21011102012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3319828 (or 3319826 counting only the distinct ones).

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

Adding to 21011102012 its reverse (21020111012), we get a palindrome (42031213024).

The spelling of 21011102012 in words is "twenty-one billion, eleven million, one hundred two thousand, twelve".