21127252105153 has 4 divisors (see below), whose sum is σ = 21642550937028. Its totient is φ = 20611953273280.

The previous prime is 21127252105121. The next prime is 21127252105159. The reversal of 21127252105153 is 35150125272112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7477123831489 + 13650128273664 = 2734433^2 + 3694608^2 .

It is a cyclic number.

It is not a de Polignac number, because 21127252105153 - 2⁵ = 21127252105121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21127252105159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257649415876 + ... + 257649415957.

It is an arithmetic number, because the mean of its divisors is an integer number (5410637734257).

Almost surely, 2^{21127252105153} is an apocalyptic number.

It is an amenable number.

21127252105153 is a deficient number, since it is larger than the sum of its proper divisors (515298831875).

21127252105153 is an equidigital number, since it uses as much as digits as its factorization.

21127252105153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515298831874.

The product of its (nonzero) digits is 42000, while the sum is 37.

Adding to 21127252105153 its reverse (35150125272112), we get a palindrome (56277377377265).

The spelling of 21127252105153 in words is "twenty-one trillion, one hundred twenty-seven billion, two hundred fifty-two million, one hundred five thousand, one hundred fifty-three".