55240010521 has 4 divisors (see below), whose sum is σ = 57144838500. Its totient is φ = 53335182544.

The previous prime is 55240010479. The next prime is 55240010533. The reversal of 55240010521 is 12501004255.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12501004255 = 5 ⋅2500200851.

It can be written as a sum of positive squares in 2 ways, for example, as 22123290121 + 33116720400 = 148739^2 + 181980^2 .

It is a cyclic number.

It is not a de Polignac number, because 55240010521 - 2⁷ = 55240010393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55240010561) 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, 952413946 + ... + 952414003.

It is an arithmetic number, because the mean of its divisors is an integer number (14286209625).

Almost surely, 2^55240010521 is an apocalyptic number.

It is an amenable number.

55240010521 is a deficient number, since it is larger than the sum of its proper divisors (1904827979).

55240010521 is a wasteful number, since it uses less digits than its factorization.

55240010521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1904827978.

The product of its (nonzero) digits is 2000, while the sum is 25.

Adding to 55240010521 its reverse (12501004255), we get a palindrome (67741014776).

The spelling of 55240010521 in words is "fifty-five billion, two hundred forty million, ten thousand, five hundred twenty-one".