21043442122212 has 24 divisors (see below), whose sum is σ = 49535890308576. Its totient is φ = 6952405656448.

The previous prime is 21043442122091. The next prime is 21043442122289. The reversal of 21043442122212 is 21222124434012.

It is a self number, because there is not a number n which added to its sum of digits gives 21043442122212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7759379958 + ... + 7759382669.

It is an arithmetic number, because the mean of its divisors is an integer number (2063995429524).

Almost surely, 2^{21043442122212} is an apocalyptic number.

It is an amenable number.

21043442122212 is an abundant number, since it is smaller than the sum of its proper divisors (28492448186364).

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

21043442122212 is a wasteful number, since it uses less digits than its factorization.

21043442122212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15518762747 (or 15518762745 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 30.

Adding to 21043442122212 its reverse (21222124434012), we get a palindrome (42265566556224).

The spelling of 21043442122212 in words is "twenty-one trillion, forty-three billion, four hundred forty-two million, one hundred twenty-two thousand, two hundred twelve".