21132111111131 has 4 divisors (see below), whose sum is σ = 21138779499000. Its totient is φ = 21125442723264.

The previous prime is 21132111111127. The next prime is 21132111111151. The reversal of 21132111111131 is 13111111123112.

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 21132111111131 - 2² = 21132111111127 is a prime.

It is a super-2 number, since 2×21132111111131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21132111111151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3334189181 + ... + 3334195518.

It is an arithmetic number, because the mean of its divisors is an integer number (5284694874750).

Almost surely, 2^{21132111111131} is an apocalyptic number.

21132111111131 is a deficient number, since it is larger than the sum of its proper divisors (6668387869).

21132111111131 is an equidigital number, since it uses as much as digits as its factorization.

21132111111131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6668387868.

The product of its digits is 36, while the sum is 20.

Adding to 21132111111131 its reverse (13111111123112), we get a palindrome (34243222234243).

The spelling of 21132111111131 in words is "twenty-one trillion, one hundred thirty-two billion, one hundred eleven million, one hundred eleven thousand, one hundred thirty-one".