21051230227 has 2 divisors, whose sum is σ = 21051230228. Its totient is φ = 21051230226.

The previous prime is 21051230209. The next prime is 21051230261. The reversal of 21051230227 is 72203215012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21051230227 - 2⁷ = 21051230099 is a prime.

It is not a weakly prime, because it can be changed into another prime (21051230287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10525615113 + 10525615114.

It is an arithmetic number, because the mean of its divisors is an integer number (10525615114).

Almost surely, 2^21051230227 is an apocalyptic number.

21051230227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21051230227 is an equidigital number, since it uses as much as digits as its factorization.

21051230227 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 25.

Adding to 21051230227 its reverse (72203215012), we get a palindrome (93254445239).

The spelling of 21051230227 in words is "twenty-one billion, fifty-one million, two hundred thirty thousand, two hundred twenty-seven".