21455160224565 has 16 divisors (see below), whose sum is σ = 34334591284800. Its totient is φ = 11440640477952.

The previous prime is 21455160224521. The next prime is 21455160224567. The reversal of 21455160224565 is 56542206155412.

It is not a de Polignac number, because 21455160224565 - 2⁷ = 21455160224437 is a prime.

It is a super-2 number, since 2×21455160224565² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21455160224567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131893620 + ... + 132056189.

It is an arithmetic number, because the mean of its divisors is an integer number (2145911955300).

Almost surely, 2^{21455160224565} is an apocalyptic number.

It is an amenable number.

21455160224565 is a deficient number, since it is larger than the sum of its proper divisors (12879431060235).

21455160224565 is a wasteful number, since it uses less digits than its factorization.

21455160224565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263955236.

The product of its (nonzero) digits is 2880000, while the sum is 48.

Adding to 21455160224565 its reverse (56542206155412), we get a palindrome (77997366379977).

The spelling of 21455160224565 in words is "twenty-one trillion, four hundred fifty-five billion, one hundred sixty million, two hundred twenty-four thousand, five hundred sixty-five".