21003113113 has 16 divisors (see below), whose sum is σ = 22543589376. Its totient is φ = 19519814160.

The previous prime is 21003113081. The next prime is 21003113129. The reversal of 21003113113 is 31131130012.

It is a cyclic number.

It is not a de Polignac number, because 21003113113 - 2⁵ = 21003113081 is a prime.

It is a super-2 number, since 2×21003113113² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21003113143) 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, 133306 + ... + 244492.

It is an arithmetic number, because the mean of its divisors is an integer number (1408974336).

Almost surely, 2^21003113113 is an apocalyptic number.

21003113113 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21003113113 is a deficient number, since it is larger than the sum of its proper divisors (1540476263).

21003113113 is a wasteful number, since it uses less digits than its factorization.

21003113113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111444.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 21003113113 its reverse (31131130012), we get a palindrome (52134243125).

The spelling of 21003113113 in words is "twenty-one billion, three million, one hundred thirteen thousand, one hundred thirteen".