21103110311 has 16 divisors (see below), whose sum is σ = 22148834400. Its totient is φ = 20080101888.

The previous prime is 21103110299. The next prime is 21103110317. The reversal of 21103110311 is 11301130112.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21103110311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103110317) 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, 779051 + ... + 805683.

It is an arithmetic number, because the mean of its divisors is an integer number (1384302150).

Almost surely, 2^21103110311 is an apocalyptic number.

21103110311 is a deficient number, since it is larger than the sum of its proper divisors (1045724089).

21103110311 is a wasteful number, since it uses less digits than its factorization.

21103110311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27058.

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 21103110311 its reverse (11301130112), we get a palindrome (32404240423).

The spelling of 21103110311 in words is "twenty-one billion, one hundred three million, one hundred ten thousand, three hundred eleven".