21522521335153 has 4 divisors (see below), whose sum is σ = 21744402998500. Its totient is φ = 21300639671808.

The previous prime is 21522521335129. The next prime is 21522521335199. The reversal of 21522521335153 is 35153312522512.

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 8420025385984 + 13102495949169 = 2901728^2 + 3619737^2 .

It is a cyclic number.

It is not a de Polignac number, because 21522521335153 - 2⁵ = 21522521335121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21522521335253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110940831528 + ... + 110940831721.

It is an arithmetic number, because the mean of its divisors is an integer number (5436100749625).

Almost surely, 2^{21522521335153} is an apocalyptic number.

It is an amenable number.

21522521335153 is a deficient number, since it is larger than the sum of its proper divisors (221881663347).

21522521335153 is an equidigital number, since it uses as much as digits as its factorization.

21522521335153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221881663346.

The product of its digits is 270000, while the sum is 40.

Adding to 21522521335153 its reverse (35153312522512), we get a palindrome (56675833857665).

The spelling of 21522521335153 in words is "twenty-one trillion, five hundred twenty-two billion, five hundred twenty-one million, three hundred thirty-five thousand, one hundred fifty-three".