21202110012 has 24 divisors (see below), whose sum is σ = 49474191312. Its totient is φ = 7066998400.

The previous prime is 21202109959. The next prime is 21202110019. The reversal of 21202110012 is 21001120212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 21202110012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202110019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287062 + ... + 353282.

It is an arithmetic number, because the mean of its divisors is an integer number (2061424638).

Almost surely, 2^21202110012 is an apocalyptic number.

It is an amenable number.

21202110012 is an abundant number, since it is smaller than the sum of its proper divisors (28272081300).

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

21202110012 is a wasteful number, since it uses less digits than its factorization.

21202110012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92909 (or 92907 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21202110012 its reverse (21001120212), we get a palindrome (42203230224).

The spelling of 21202110012 in words is "twenty-one billion, two hundred two million, one hundred ten thousand, twelve".