54155525231021 has 4 divisors (see below), whose sum is σ = 54500464882332. Its totient is φ = 53810585579712.

The previous prime is 54155525230987. The next prime is 54155525231057. The reversal of 54155525231021 is 12013252555145.

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 36079303626025 + 18076221604996 = 6006605^2 + 4251614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54155525231021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 54155525231021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54155515231021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172469825420 + ... + 172469825733.

It is an arithmetic number, because the mean of its divisors is an integer number (13625116220583).

Almost surely, 2^{54155525231021} is an apocalyptic number.

It is an amenable number.

54155525231021 is a deficient number, since it is larger than the sum of its proper divisors (344939651311).

54155525231021 is a wasteful number, since it uses less digits than its factorization.

54155525231021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344939651310.

The product of its (nonzero) digits is 300000, while the sum is 41.

Adding to 54155525231021 its reverse (12013252555145), we get a palindrome (66168777786166).

The spelling of 54155525231021 in words is "fifty-four trillion, one hundred fifty-five billion, five hundred twenty-five million, two hundred thirty-one thousand, twenty-one".