21146114065 has 4 divisors (see below), whose sum is σ = 25375336884. Its totient is φ = 16916891248.

The previous prime is 21146114057. The next prime is 21146114069. The reversal of 21146114065 is 56041164112.

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 6116334849 + 15029779216 = 78207^2 + 122596^2 .

It is a cyclic number.

It is not a de Polignac number, because 21146114065 - 2³ = 21146114057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21146114069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2114611402 + ... + 2114611411.

It is an arithmetic number, because the mean of its divisors is an integer number (6343834221).

Almost surely, 2^21146114065 is an apocalyptic number.

It is an amenable number.

21146114065 is a deficient number, since it is larger than the sum of its proper divisors (4229222819).

21146114065 is an equidigital number, since it uses as much as digits as its factorization.

21146114065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4229222818.

The product of its (nonzero) digits is 5760, while the sum is 31.

Adding to 21146114065 its reverse (56041164112), we get a palindrome (77187278177).

The spelling of 21146114065 in words is "twenty-one billion, one hundred forty-six million, one hundred fourteen thousand, sixty-five".