21522254145353 has 32 divisors (see below), whose sum is σ = 23838599544480. Its totient is φ = 19301874462720.

The previous prime is 21522254145341. The next prime is 21522254145361. The reversal of 21522254145353 is 35354145222512.

It can be written as a sum of positive squares in 16 ways, for example, as 2874608348089 + 18647645797264 = 1695467^2 + 4318292^2 .

It is a cyclic number.

It is not a de Polignac number, because 21522254145353 - 2⁶ = 21522254145289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21522254115353) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1310646083 + ... + 1310662503.

It is an arithmetic number, because the mean of its divisors is an integer number (744956235765).

Almost surely, 2^{21522254145353} is an apocalyptic number.

It is an amenable number.

21522254145353 is a deficient number, since it is larger than the sum of its proper divisors (2316345399127).

21522254145353 is a wasteful number, since it uses less digits than its factorization.

21522254145353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20237.

The product of its digits is 1440000, while the sum is 44.

Adding to 21522254145353 its reverse (35354145222512), we get a palindrome (56876399367865).

The spelling of 21522254145353 in words is "twenty-one trillion, five hundred twenty-two billion, two hundred fifty-four million, one hundred forty-five thousand, three hundred fifty-three".