21111031303113 has 4 divisors (see below), whose sum is σ = 28148041737488. Its totient is φ = 14074020868740.

The previous prime is 21111031303081. The next prime is 21111031303127. The reversal of 21111031303113 is 31130313011112.

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 not a de Polignac number, because 21111031303113 - 2⁵ = 21111031303081 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21111031303113.

It is not an unprimeable number, because it can be changed into a prime (21111031303183) 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, 3518505217183 + ... + 3518505217188.

It is an arithmetic number, because the mean of its divisors is an integer number (7037010434372).

Almost surely, 2^{21111031303113} is an apocalyptic number.

It is an amenable number.

21111031303113 is a deficient number, since it is larger than the sum of its proper divisors (7037010434375).

21111031303113 is an equidigital number, since it uses as much as digits as its factorization.

21111031303113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7037010434374.

The product of its (nonzero) digits is 162, while the sum is 21.

Adding to 21111031303113 its reverse (31130313011112), we get a palindrome (52241344314225).

The spelling of 21111031303113 in words is "twenty-one trillion, one hundred eleven billion, thirty-one million, three hundred three thousand, one hundred thirteen".