21031100013111 has 32 divisors (see below), whose sum is σ = 30111486912000. Its totient is φ = 13009114460160.

The previous prime is 21031100013071. The next prime is 21031100013197. The reversal of 21031100013111 is 11131000113012.

It is not a de Polignac number, because 21031100013111 - 2¹¹ = 21031100011063 is a prime.

It is a super-2 number, since 2×21031100013111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031100023111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47791815 + ... + 48229863.

It is an arithmetic number, because the mean of its divisors is an integer number (940983966000).

Almost surely, 2^{21031100013111} is an apocalyptic number.

21031100013111 is a deficient number, since it is larger than the sum of its proper divisors (9080386898889).

21031100013111 is a wasteful number, since it uses less digits than its factorization.

21031100013111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451399.

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 21031100013111 its reverse (11131000113012), we get a palindrome (32162100126123).

Subtracting from 21031100013111 its reverse (11131000113012), we obtain a palindrome (9900099900099).

The spelling of 21031100013111 in words is "twenty-one trillion, thirty-one billion, one hundred million, thirteen thousand, one hundred eleven".