53120087621 has 4 divisors (see below), whose sum is σ = 55429656672. Its totient is φ = 50810518572.

The previous prime is 53120087597. The next prime is 53120087687. The reversal of 53120087621 is 12678002135.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 53120087621 - 2¹⁰ = 53120086597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53120087021) 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, 1154784491 + ... + 1154784536.

It is an arithmetic number, because the mean of its divisors is an integer number (13857414168).

Almost surely, 2^53120087621 is an apocalyptic number.

It is an amenable number.

53120087621 is a deficient number, since it is larger than the sum of its proper divisors (2309569051).

53120087621 is a wasteful number, since it uses less digits than its factorization.

53120087621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2309569050.

The product of its (nonzero) digits is 20160, while the sum is 35.

Adding to 53120087621 its reverse (12678002135), we get a palindrome (65798089756).

The spelling of 53120087621 in words is "fifty-three billion, one hundred twenty million, eighty-seven thousand, six hundred twenty-one".