21385863227 has 2 divisors, whose sum is σ = 21385863228. Its totient is φ = 21385863226.

The previous prime is 21385863217. The next prime is 21385863253. The reversal of 21385863227 is 72236858312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21385863227 - 2¹⁰ = 21385862203 is a prime.

It is not a weakly prime, because it can be changed into another prime (21385863217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10692931613 + 10692931614.

It is an arithmetic number, because the mean of its divisors is an integer number (10692931614).

Almost surely, 2^21385863227 is an apocalyptic number.

21385863227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21385863227 is an equidigital number, since it uses as much as digits as its factorization.

21385863227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 47.

The spelling of 21385863227 in words is "twenty-one billion, three hundred eighty-five million, eight hundred sixty-three thousand, two hundred twenty-seven".