21003131113 has 4 divisors (see below), whose sum is σ = 21077347408. Its totient is φ = 20928914820.

The previous prime is 21003131111. The next prime is 21003131119. The reversal of 21003131113 is 31113130012.

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 21003131113 - 2¹ = 21003131111 is a prime.

It is a super-2 number, since 2×21003131113² (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 (21003131111) 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, 37107723 + ... + 37108288.

It is an arithmetic number, because the mean of its divisors is an integer number (5269336852).

Almost surely, 2^21003131113 is an apocalyptic number.

It is an amenable number.

21003131113 is a deficient number, since it is larger than the sum of its proper divisors (74216295).

21003131113 is an equidigital number, since it uses as much as digits as its factorization.

21003131113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74216294.

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

Adding to 21003131113 its reverse (31113130012), we get a palindrome (52116261125).

The spelling of 21003131113 in words is "twenty-one billion, three million, one hundred thirty-one thousand, one hundred thirteen".