21133132131 has 4 divisors (see below), whose sum is σ = 28177509512. Its totient is φ = 14088754752.

The previous prime is 21133132099. The next prime is 21133132169. The reversal of 21133132131 is 13123133112.

It is a happy number.

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

It is not a de Polignac number, because 21133132131 - 2⁵ = 21133132099 is a prime.

It is a super-2 number, since 2×21133132131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21133132098 and 21133132107.

It is not an unprimeable number, because it can be changed into a prime (21133332131) 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, 3522188686 + ... + 3522188691.

It is an arithmetic number, because the mean of its divisors is an integer number (7044377378).

Almost surely, 2^21133132131 is an apocalyptic number.

21133132131 is a deficient number, since it is larger than the sum of its proper divisors (7044377381).

21133132131 is an equidigital number, since it uses as much as digits as its factorization.

21133132131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7044377380.

The product of its digits is 324, while the sum is 21.

Adding to 21133132131 its reverse (13123133112), we get a palindrome (34256265243).

The spelling of 21133132131 in words is "twenty-one billion, one hundred thirty-three million, one hundred thirty-two thousand, one hundred thirty-one".