21010200012 has 24 divisors (see below), whose sum is σ = 54470889200. Its totient is φ = 7003399968.

The previous prime is 21010199983. The next prime is 21010200037. The reversal of 21010200012 is 21000201012.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21010199967 and 21010200003.

It is an unprimeable number.

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, 97269337 + ... + 97269552.

Almost surely, 2^21010200012 is an apocalyptic number.

It is an amenable number.

21010200012 is an abundant number, since it is smaller than the sum of its proper divisors (33460689188).

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

21010200012 is a wasteful number, since it uses less digits than its factorization.

21010200012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194538902 (or 194538894 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21010200012 its reverse (21000201012), we get a palindrome (42010401024).

The spelling of 21010200012 in words is "twenty-one billion, ten million, two hundred thousand, twelve".