21154241027 has 2 divisors, whose sum is σ = 21154241028. Its totient is φ = 21154241026.

The previous prime is 21154241011. The next prime is 21154241039. The reversal of 21154241027 is 72014245112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21154241027 - 2⁴ = 21154241011 is a prime.

It is not a weakly prime, because it can be changed into another prime (21154211027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10577120513 + 10577120514.

It is an arithmetic number, because the mean of its divisors is an integer number (10577120514).

Almost surely, 2^21154241027 is an apocalyptic number.

21154241027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21154241027 is an equidigital number, since it uses as much as digits as its factorization.

21154241027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 29.

Adding to 21154241027 its reverse (72014245112), we get a palindrome (93168486139).

The spelling of 21154241027 in words is "twenty-one billion, one hundred fifty-four million, two hundred forty-one thousand, twenty-seven".