21211202112 has 28 divisors (see below), whose sum is σ = 56121306096. Its totient is φ = 7070400640.

The previous prime is 21211202099. The next prime is 21211202119. The reversal of 21211202112 is 21120211212.

It is a super-2 number, since 2×21211202112² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21211202091 and 21211202100.

It is not an unprimeable number, because it can be changed into a prime (21211202119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55237314 + ... + 55237697.

Almost surely, 2^21211202112 is an apocalyptic number.

It is an amenable number.

21211202112 is an abundant number, since it is smaller than the sum of its proper divisors (34910103984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21211202112 is a wasteful number, since it uses less digits than its factorization.

21211202112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110475026 (or 110475016 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21211202112 its reverse (21120211212), we get a palindrome (42331413324).

The spelling of 21211202112 in words is "twenty-one billion, two hundred eleven million, two hundred two thousand, one hundred twelve".