21131034111 has 32 divisors (see below), whose sum is σ = 34169990400. Its totient is φ = 12799628640.

The previous prime is 21131034107. The next prime is 21131034143. The reversal of 21131034111 is 11143013112.

It is a happy number.

21131034111 is a `hidden beast` number, since 2 + 1 + 1 + 310 + 341 + 11 = 666.

It is not a de Polignac number, because 21131034111 - 2² = 21131034107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131034101) 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, 547725 + ... + 585033.

It is an arithmetic number, because the mean of its divisors is an integer number (1067812200).

Almost surely, 2^21131034111 is an apocalyptic number.

21131034111 is a deficient number, since it is larger than the sum of its proper divisors (13038956289).

21131034111 is a wasteful number, since it uses less digits than its factorization.

21131034111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39236 (or 39230 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21131034111 its reverse (11143013112), we get a palindrome (32274047223).

The spelling of 21131034111 in words is "twenty-one billion, one hundred thirty-one million, thirty-four thousand, one hundred eleven".