21130032111 has 4 divisors (see below), whose sum is σ = 28173376152. Its totient is φ = 14086688072.

The previous prime is 21130032101. The next prime is 21130032163. The reversal of 21130032111 is 11123003112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21130032111 - 2⁹ = 21130031599 is a prime.

It is a super-2 number, since 2×21130032111² (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 (21130032101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3521672016 + ... + 3521672021.

It is an arithmetic number, because the mean of its divisors is an integer number (7043344038).

Almost surely, 2^21130032111 is an apocalyptic number.

21130032111 is a deficient number, since it is larger than the sum of its proper divisors (7043344041).

21130032111 is an equidigital number, since it uses as much as digits as its factorization.

21130032111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7043344040.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21130032111 its reverse (11123003112), we get a palindrome (32253035223).

The spelling of 21130032111 in words is "twenty-one billion, one hundred thirty million, thirty-two thousand, one hundred eleven".