21245537227 has 2 divisors, whose sum is σ = 21245537228. Its totient is φ = 21245537226.

The previous prime is 21245537191. The next prime is 21245537237. The reversal of 21245537227 is 72273554212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21245537227 - 2⁷ = 21245537099 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21245537227.

It is not a weakly prime, because it can be changed into another prime (21245537237) 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, 10622768613 + 10622768614.

It is an arithmetic number, because the mean of its divisors is an integer number (10622768614).

Almost surely, 2^21245537227 is an apocalyptic number.

21245537227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21245537227 is an equidigital number, since it uses as much as digits as its factorization.

21245537227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 235200, while the sum is 40.

The spelling of 21245537227 in words is "twenty-one billion, two hundred forty-five million, five hundred thirty-seven thousand, two hundred twenty-seven".