21011102212 has 24 divisors (see below), whose sum is σ = 37635488352. Its totient is φ = 10258248000.

The previous prime is 21011102191. The next prime is 21011102219. The reversal of 21011102212 is 21220111012.

It is a super-2 number, since 2×21011102212² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21011102192 and 21011102201.

It is not an unprimeable number, because it can be changed into a prime (21011102219) by changing a digit.

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, 646512 + ... + 678232.

It is an arithmetic number, because the mean of its divisors is an integer number (1568145348).

Almost surely, 2^21011102212 is an apocalyptic number.

It is an amenable number.

21011102212 is a deficient number, since it is larger than the sum of its proper divisors (16624386140).

21011102212 is a wasteful number, since it uses less digits than its factorization.

21011102212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35619 (or 35617 counting only the distinct ones).

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

Adding to 21011102212 its reverse (21220111012), we get a palindrome (42231213224).

The spelling of 21011102212 in words is "twenty-one billion, eleven million, one hundred two thousand, two hundred twelve".