21143111013 has 12 divisors (see below), whose sum is σ = 30544502508. Its totient is φ = 14093352000.

The previous prime is 21143110993. The next prime is 21143111047. The reversal of 21143111013 is 31011134112.

It is a happy number.

21143111013 is a `hidden beast` number, since 211 + 431 + 1 + 10 + 13 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4088579364 + 17054531649 = 63942^2 + 130593^2 .

It is not a de Polignac number, because 21143111013 - 2¹⁰ = 21143109989 is a prime.

It is a super-2 number, since 2×21143111013² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143111063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104770 + ... + 230787.

It is an arithmetic number, because the mean of its divisors is an integer number (2545375209).

Almost surely, 2^21143111013 is an apocalyptic number.

It is an amenable number.

21143111013 is a deficient number, since it is larger than the sum of its proper divisors (9401391495).

21143111013 is a wasteful number, since it uses less digits than its factorization.

21143111013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342564 (or 342561 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21143111013 its reverse (31011134112), we get a palindrome (52154245125).

The spelling of 21143111013 in words is "twenty-one billion, one hundred forty-three million, one hundred eleven thousand, thirteen".