21112711005 has 16 divisors (see below), whose sum is σ = 33955369920. Its totient is φ = 11201768448.

The previous prime is 21112711001. The next prime is 21112711019. The reversal of 21112711005 is 50011721112.

It is not a de Polignac number, because 21112711005 - 2² = 21112711001 is a prime.

It is a super-2 number, since 2×21112711005² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112711001) 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, 3643515 + ... + 3649304.

It is an arithmetic number, because the mean of its divisors is an integer number (2122210620).

Almost surely, 2^21112711005 is an apocalyptic number.

It is an amenable number.

21112711005 is a deficient number, since it is larger than the sum of its proper divisors (12842658915).

21112711005 is a wasteful number, since it uses less digits than its factorization.

21112711005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7293020.

The product of its (nonzero) digits is 140, while the sum is 21.

The spelling of 21112711005 in words is "twenty-one billion, one hundred twelve million, seven hundred eleven thousand, five".