21003031113 has 4 divisors (see below), whose sum is σ = 28004041488. Its totient is φ = 14002020740.

The previous prime is 21003031037. The next prime is 21003031117. The reversal of 21003031113 is 31113030012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21003031113 - 2³⁴ = 3823161929 is a prime.

It is a super-2 number, since 2×21003031113² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003031092 and 21003031101.

It is not an unprimeable number, because it can be changed into a prime (21003031117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3500505183 + ... + 3500505188.

It is an arithmetic number, because the mean of its divisors is an integer number (7001010372).

Almost surely, 2^21003031113 is an apocalyptic number.

It is an amenable number.

21003031113 is a deficient number, since it is larger than the sum of its proper divisors (7001010375).

21003031113 is an equidigital number, since it uses as much as digits as its factorization.

21003031113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7001010374.

The product of its (nonzero) digits is 54, while the sum is 15.

Adding to 21003031113 its reverse (31113030012), we get a palindrome (52116061125).

The spelling of 21003031113 in words is "twenty-one billion, three million, thirty-one thousand, one hundred thirteen".