21200030012 has 48 divisors (see below), whose sum is σ = 43040245248. Its totient is φ = 8948802240.

The previous prime is 21200030011. The next prime is 21200030039. The reversal of 21200030012 is 21003000212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21200029975 and 21200030002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200030011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2215823 + ... + 2225369.

It is an arithmetic number, because the mean of its divisors is an integer number (896671776).

Almost surely, 2^21200030012 is an apocalyptic number.

It is an amenable number.

21200030012 is an abundant number, since it is smaller than the sum of its proper divisors (21840215236).

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

21200030012 is a wasteful number, since it uses less digits than its factorization.

21200030012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10746 (or 10744 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 21200030012 its reverse (21003000212), we get a palindrome (42203030224).

The spelling of 21200030012 in words is "twenty-one billion, two hundred million, thirty thousand, twelve".