53551250121421 has 4 divisors (see below), whose sum is σ = 57670577053852. Its totient is φ = 49431923188992.

The previous prime is 53551250121409. The next prime is 53551250121461. The reversal of 53551250121421 is 12412105215535.

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 4486983062500 + 49064267058921 = 2118250^2 + 7004589^2 .

It is a cyclic number.

It is not a de Polignac number, because 53551250121421 - 2⁷ = 53551250121293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53551250121461) 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, 2059663466196 + ... + 2059663466221.

It is an arithmetic number, because the mean of its divisors is an integer number (14417644263463).

Almost surely, 2^{53551250121421} is an apocalyptic number.

It is an amenable number.

53551250121421 is a deficient number, since it is larger than the sum of its proper divisors (4119326932431).

53551250121421 is a wasteful number, since it uses less digits than its factorization.

53551250121421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4119326932430.

The product of its (nonzero) digits is 60000, while the sum is 37.

Adding to 53551250121421 its reverse (12412105215535), we get a palindrome (65963355336956).

The spelling of 53551250121421 in words is "fifty-three trillion, five hundred fifty-one billion, two hundred fifty million, one hundred twenty-one thousand, four hundred twenty-one".