21231231227 has 2 divisors, whose sum is σ = 21231231228. Its totient is φ = 21231231226.

The previous prime is 21231231221. The next prime is 21231231247. The reversal of 21231231227 is 72213213212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21231231227 - 2⁴ = 21231231211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21231231196 and 21231231205.

It is not a weakly prime, because it can be changed into another prime (21231231221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615615613 + 10615615614.

It is an arithmetic number, because the mean of its divisors is an integer number (10615615614).

Almost surely, 2^21231231227 is an apocalyptic number.

21231231227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21231231227 is an equidigital number, since it uses as much as digits as its factorization.

21231231227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 26.

Adding to 21231231227 its reverse (72213213212), we get a palindrome (93444444439).

The spelling of 21231231227 in words is "twenty-one billion, two hundred thirty-one million, two hundred thirty-one thousand, two hundred twenty-seven".