21201200010012 has 96 divisors (see below), whose sum is σ = 55861671075840. Its totient is φ = 6201747659520.

The previous prime is 21201200010007. The next prime is 21201200010031. The reversal of 21201200010012 is 21001000210212.

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 21201200010012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16470087 + ... + 17710622.

It is an arithmetic number, because the mean of its divisors is an integer number (581892407040).

Almost surely, 2^{21201200010012} is an apocalyptic number.

21201200010012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21201200010012 is an abundant number, since it is smaller than the sum of its proper divisors (34660471065828).

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

21201200010012 is a wasteful number, since it uses less digits than its factorization.

21201200010012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34180891 (or 34180889 counting only the distinct ones).

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

Adding to 21201200010012 its reverse (21001000210212), we get a palindrome (42202200220224).

The spelling of 21201200010012 in words is "twenty-one trillion, two hundred one billion, two hundred million, ten thousand, twelve".