21031031227 has 2 divisors, whose sum is σ = 21031031228. Its totient is φ = 21031031226.

The previous prime is 21031031149. The next prime is 21031031233. The reversal of 21031031227 is 72213013012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21031031227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21031031198 and 21031031207.

It is not a weakly prime, because it can be changed into another prime (21031031257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515515613 + 10515515614.

It is an arithmetic number, because the mean of its divisors is an integer number (10515515614).

Almost surely, 2^21031031227 is an apocalyptic number.

21031031227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031031227 is an equidigital number, since it uses as much as digits as its factorization.

21031031227 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 22.

Adding to 21031031227 its reverse (72213013012), we get a palindrome (93244044239).

The spelling of 21031031227 in words is "twenty-one billion, thirty-one million, thirty-one thousand, two hundred twenty-seven".