21211102012 has 12 divisors (see below), whose sum is σ = 37179986536. Its totient is φ = 10588248720.

The previous prime is 21211101941. The next prime is 21211102013. The reversal of 21211102012 is 21020111212.

It is a junction number, because it is equal to n+sod(n) for n = 21211101983 and 21211102001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211102013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4322814 + ... + 4327717.

Almost surely, 2^21211102012 is an apocalyptic number.

It is an amenable number.

21211102012 is a deficient number, since it is larger than the sum of its proper divisors (15968884524).

21211102012 is a wasteful number, since it uses less digits than its factorization.

21211102012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8651148 (or 8651146 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21211102012 its reverse (21020111212), we get a palindrome (42231213224).

It can be divided in two parts, 212 and 11102012, that added together give a square (11102224 = 3332²).

The spelling of 21211102012 in words is "twenty-one billion, two hundred eleven million, one hundred two thousand, twelve".