21112132231 has 2 divisors, whose sum is σ = 21112132232. Its totient is φ = 21112132230.

The previous prime is 21112132189. The next prime is 21112132259. The reversal of 21112132231 is 13223121112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21112132231 - 2²³ = 21103743623 is a prime.

It is a super-2 number, since 2×21112132231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21112132199 and 21112132208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112132291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556066115 + 10556066116.

It is an arithmetic number, because the mean of its divisors is an integer number (10556066116).

Almost surely, 2^21112132231 is an apocalyptic number.

21112132231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112132231 is an equidigital number, since it uses as much as digits as its factorization.

21112132231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 19.

Adding to 21112132231 its reverse (13223121112), we get a palindrome (34335253343).

The spelling of 21112132231 in words is "twenty-one billion, one hundred twelve million, one hundred thirty-two thousand, two hundred thirty-one".