21111004431012 has 12 divisors (see below), whose sum is σ = 49259010339056. Its totient is φ = 7037001477000.

The previous prime is 21111004430981. The next prime is 21111004431019. The reversal of 21111004431012 is 21013440011112.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 21111004431012.

It is not an unprimeable number, because it can be changed into a prime (21111004431019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 879625184614 + ... + 879625184637.

Almost surely, 2^{21111004431012} is an apocalyptic number.

It is an amenable number.

21111004431012 is an abundant number, since it is smaller than the sum of its proper divisors (28148005908044).

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

21111004431012 is a wasteful number, since it uses less digits than its factorization.

21111004431012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1759250369258 (or 1759250369256 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 21111004431012 its reverse (21013440011112), we get a palindrome (42124444442124).

The spelling of 21111004431012 in words is "twenty-one trillion, one hundred eleven billion, four million, four hundred thirty-one thousand, twelve".