21030321227 has 2 divisors, whose sum is σ = 21030321228. Its totient is φ = 21030321226.

The previous prime is 21030321199. The next prime is 21030321233. The reversal of 21030321227 is 72212303012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21030321227 - 2¹² = 21030317131 is a prime.

It is not a weakly prime, because it can be changed into another prime (21030371227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515160613 + 10515160614.

It is an arithmetic number, because the mean of its divisors is an integer number (10515160614).

Almost surely, 2^21030321227 is an apocalyptic number.

21030321227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030321227 is an equidigital number, since it uses as much as digits as its factorization.

21030321227 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 23.

Adding to 21030321227 its reverse (72212303012), we get a palindrome (93242624239).

The spelling of 21030321227 in words is "twenty-one billion, thirty million, three hundred twenty-one thousand, two hundred twenty-seven".