21430409227 has 2 divisors, whose sum is σ = 21430409228. Its totient is φ = 21430409226.

The previous prime is 21430409201. The next prime is 21430409233. The reversal of 21430409227 is 72290403412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21430409227 - 2³¹ = 19282925579 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21430409192 and 21430409201.

It is not a weakly prime, because it can be changed into another prime (21430409257) 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, 10715204613 + 10715204614.

It is an arithmetic number, because the mean of its divisors is an integer number (10715204614).

Almost surely, 2^21430409227 is an apocalyptic number.

21430409227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21430409227 is an equidigital number, since it uses as much as digits as its factorization.

21430409227 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 34.

The spelling of 21430409227 in words is "twenty-one billion, four hundred thirty million, four hundred nine thousand, two hundred twenty-seven".