53125135621 has 4 divisors (see below), whose sum is σ = 53126863200. Its totient is φ = 53123408044.

The previous prime is 53125135619. The next prime is 53125135633. The reversal of 53125135621 is 12653152135.

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 53125135621 - 2¹ = 53125135619 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 (53125195621) 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, 816811 + ... + 879448.

It is an arithmetic number, because the mean of its divisors is an integer number (13281715800).

Almost surely, 2^53125135621 is an apocalyptic number.

It is an amenable number.

53125135621 is a deficient number, since it is larger than the sum of its proper divisors (1727579).

53125135621 is a wasteful number, since it uses less digits than its factorization.

53125135621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1727578.

The product of its digits is 27000, while the sum is 34.

Adding to 53125135621 its reverse (12653152135), we get a palindrome (65778287756).

The spelling of 53125135621 in words is "fifty-three billion, one hundred twenty-five million, one hundred thirty-five thousand, six hundred twenty-one".