53155342520521 has 16 divisors (see below), whose sum is σ = 55278146911104. Its totient is φ = 51071497449984.

The previous prime is 53155342520519. The next prime is 53155342520563. The reversal of 53155342520521 is 12502524355135.

It is a cyclic number.

It is not a de Polignac number, because 53155342520521 - 2¹ = 53155342520519 is a prime.

It is a super-2 number, since 2×53155342520521² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53155342521521) 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, 18410911 + ... + 21101476.

It is an arithmetic number, because the mean of its divisors is an integer number (3454884181944).

Almost surely, 2^{53155342520521} is an apocalyptic number.

It is an amenable number.

53155342520521 is a deficient number, since it is larger than the sum of its proper divisors (2122804390583).

53155342520521 is a wasteful number, since it uses less digits than its factorization.

53155342520521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39512880.

The product of its (nonzero) digits is 900000, while the sum is 43.

Adding to 53155342520521 its reverse (12502524355135), we get a palindrome (65657866875656).

The spelling of 53155342520521 in words is "fifty-three trillion, one hundred fifty-five billion, three hundred forty-two million, five hundred twenty thousand, five hundred twenty-one".