21103310011 has 4 divisors (see below), whose sum is σ = 24118068592. Its totient is φ = 18088551432.

The previous prime is 21103310003. The next prime is 21103310017. The reversal of 21103310011 is 11001330112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21103310011 - 2³ = 21103310003 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21103309973 and 21103310000.

It is not an unprimeable number, because it can be changed into a prime (21103310017) 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, 1507379280 + ... + 1507379293.

It is an arithmetic number, because the mean of its divisors is an integer number (6029517148).

Almost surely, 2^21103310011 is an apocalyptic number.

21103310011 is a deficient number, since it is larger than the sum of its proper divisors (3014758581).

21103310011 is an equidigital number, since it uses as much as digits as its factorization.

21103310011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3014758580.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 21103310011 its reverse (11001330112), we get a palindrome (32104640123).

The spelling of 21103310011 in words is "twenty-one billion, one hundred three million, three hundred ten thousand, eleven".