21020001227 has 2 divisors, whose sum is σ = 21020001228. Its totient is φ = 21020001226.

The previous prime is 21020001209. The next prime is 21020001229. The reversal of 21020001227 is 72210002012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21020001227 - 2¹⁰ = 21020000203 is a prime.

Together with 21020001229, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21020001229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510000613 + 10510000614.

It is an arithmetic number, because the mean of its divisors is an integer number (10510000614).

Almost surely, 2^21020001227 is an apocalyptic number.

21020001227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020001227 is an equidigital number, since it uses as much as digits as its factorization.

21020001227 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 17.

Adding to 21020001227 its reverse (72210002012), we get a palindrome (93230003239).

The spelling of 21020001227 in words is "twenty-one billion, twenty million, one thousand, two hundred twenty-seven".