21000031133113 has 16 divisors (see below), whose sum is σ = 21071497071616. Its totient is φ = 20928704968080.

The previous prime is 21000031133099. The next prime is 21000031133117. The reversal of 21000031133113 is 31133113000012.

It is a cyclic number.

It is not a de Polignac number, because 21000031133113 - 2⁹ = 21000031132601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000031133117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1607589820 + ... + 1607602882.

It is an arithmetic number, because the mean of its divisors is an integer number (1316968566976).

Almost surely, 2^{21000031133113} is an apocalyptic number.

It is an amenable number.

21000031133113 is a deficient number, since it is larger than the sum of its proper divisors (71465938503).

21000031133113 is a wasteful number, since it uses less digits than its factorization.

21000031133113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18004.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 21000031133113 its reverse (31133113000012), we get a palindrome (52133144133125).

The spelling of 21000031133113 in words is "twenty-one trillion, thirty-one million, one hundred thirty-three thousand, one hundred thirteen".