21003112113 has 16 divisors (see below), whose sum is σ = 28374057600. Its totient is φ = 13817949696.

The previous prime is 21003112099. The next prime is 21003112127. The reversal of 21003112113 is 31121130012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21003112099) and next prime (21003112127).

It is not a de Polignac number, because 21003112113 - 2¹² = 21003108017 is a prime.

It is a super-2 number, since 2×21003112113² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003112092 and 21003112101.

It is not an unprimeable number, because it can be changed into a prime (21003112313) 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 15 ways as a sum of consecutive naturals, for example, 1845 + ... + 204962.

It is an arithmetic number, because the mean of its divisors is an integer number (1773378600).

Almost surely, 2^21003112113 is an apocalyptic number.

It is an amenable number.

21003112113 is a deficient number, since it is larger than the sum of its proper divisors (7370945487).

21003112113 is a wasteful number, since it uses less digits than its factorization.

21003112113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207256.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21003112113 its reverse (31121130012), we get a palindrome (52124242125).

The spelling of 21003112113 in words is "twenty-one billion, three million, one hundred twelve thousand, one hundred thirteen".