21132321131 has 2 divisors, whose sum is σ = 21132321132. Its totient is φ = 21132321130.

The previous prime is 21132321127. The next prime is 21132321143. The reversal of 21132321131 is 13112323112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21132321131 - 2² = 21132321127 is a prime.

It is a super-2 number, since 2×21132321131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21132321181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566160565 + 10566160566.

It is an arithmetic number, because the mean of its divisors is an integer number (10566160566).

Almost surely, 2^21132321131 is an apocalyptic number.

21132321131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21132321131 is an equidigital number, since it uses as much as digits as its factorization.

21132321131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 20.

Adding to 21132321131 its reverse (13112323112), we get a palindrome (34244644243).

The spelling of 21132321131 in words is "twenty-one billion, one hundred thirty-two million, three hundred twenty-one thousand, one hundred thirty-one".