21311042203412 has 12 divisors (see below), whose sum is σ = 40163117998836. Its totient is φ = 9835865632320.

The previous prime is 21311042203369. The next prime is 21311042203421. The reversal of 21311042203412 is 21430224011312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10109945188996 + 11201097014416 = 3179614^2 + 3346804^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

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 3 ways as a sum of consecutive naturals, for example, 204913867289 + ... + 204913867392.

It is an arithmetic number, because the mean of its divisors is an integer number (3346926499903).

Almost surely, 2^{21311042203412} is an apocalyptic number.

It is an amenable number.

21311042203412 is a deficient number, since it is larger than the sum of its proper divisors (18852075795424).

21311042203412 is a wasteful number, since it uses less digits than its factorization.

21311042203412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409827734698 (or 409827734696 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 21311042203412 its reverse (21430224011312), we get a palindrome (42741266214724).

The spelling of 21311042203412 in words is "twenty-one trillion, three hundred eleven billion, forty-two million, two hundred three thousand, four hundred twelve".