21111012001012 has 24 divisors (see below), whose sum is σ = 37892131429320. Its totient is φ = 10285325207040.

The previous prime is 21111012001007. The next prime is 21111012001019. The reversal of 21111012001012 is 21010021011112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3755239368336 + 17355772632676 = 1937844^2 + 4166026^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21111012000983 and 21111012001001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111012001019) 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, 79425843 + ... + 79691194.

It is an arithmetic number, because the mean of its divisors is an integer number (1578838809555).

Almost surely, 2^{21111012001012} is an apocalyptic number.

It is an amenable number.

21111012001012 is a deficient number, since it is larger than the sum of its proper divisors (16781119428308).

21111012001012 is a wasteful number, since it uses less digits than its factorization.

21111012001012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159117891 (or 159117889 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21111012001012 its reverse (21010021011112), we get a palindrome (42121033012124).

The spelling of 21111012001012 in words is "twenty-one trillion, one hundred eleven billion, twelve million, one thousand, twelve".