21102203212 has 12 divisors (see below), whose sum is σ = 36929878216. Its totient is φ = 10550809440.

The previous prime is 21102203179. The next prime is 21102203257. The reversal of 21102203212 is 21230220112.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220912 + ... + 301672.

Almost surely, 2^21102203212 is an apocalyptic number.

It is an amenable number.

21102203212 is a deficient number, since it is larger than the sum of its proper divisors (15827675004).

21102203212 is a wasteful number, since it uses less digits than its factorization.

21102203212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146088 (or 146086 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21102203212 its reverse (21230220112), we get a palindrome (42332423324).

The spelling of 21102203212 in words is "twenty-one billion, one hundred two million, two hundred three thousand, two hundred twelve".