21000111331412 has 6 divisors (see below), whose sum is σ = 36750194829978. Its totient is φ = 10500055665704.

The previous prime is 21000111331403. The next prime is 21000111331439. The reversal of 21000111331412 is 21413311100012.

It can be written as a sum of positive squares in only one way, i.e., 12398877609616 + 8601233721796 = 3521204^2 + 2932786^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625013916423 + ... + 2625013916430.

It is an arithmetic number, because the mean of its divisors is an integer number (6125032471663).

Almost surely, 2^{21000111331412} is an apocalyptic number.

It is an amenable number.

21000111331412 is a deficient number, since it is larger than the sum of its proper divisors (15750083498566).

21000111331412 is a wasteful number, since it uses less digits than its factorization.

21000111331412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5250027832857 (or 5250027832855 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21000111331412 its reverse (21413311100012), we get a palindrome (42413422431424).

The spelling of 21000111331412 in words is "twenty-one trillion, one hundred eleven million, three hundred thirty-one thousand, four hundred twelve".