21102200012 has 12 divisors (see below), whose sum is σ = 37026290280. Its totient is φ = 10523259936.

The previous prime is 21102199997. The next prime is 21102200017. The reversal of 21102200012 is 21000220112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21102199966 and 21102200002.

It is not an unprimeable number, because it can be changed into a prime (21102200017) 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, 6958313 + ... + 6961344.

It is an arithmetic number, because the mean of its divisors is an integer number (3085524190).

Almost surely, 2^21102200012 is an apocalyptic number.

It is an amenable number.

21102200012 is a deficient number, since it is larger than the sum of its proper divisors (15924090268).

21102200012 is a wasteful number, since it uses less digits than its factorization.

21102200012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13920040 (or 13920038 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21102200012 its reverse (21000220112), we get a palindrome (42102420124).

The spelling of 21102200012 in words is "twenty-one billion, one hundred two million, two hundred thousand, twelve".