521201155253 has 4 divisors (see below), whose sum is σ = 527480687328. Its totient is φ = 514921623180.

The previous prime is 521201155219. The next prime is 521201155271. The reversal of 521201155253 is 352551102125.

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 521201155253 - 2¹⁴ = 521201138869 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 (521201155753) 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, 3139765913 + ... + 3139766078.

It is an arithmetic number, because the mean of its divisors is an integer number (131870171832).

Almost surely, 2^521201155253 is an apocalyptic number.

It is an amenable number.

521201155253 is a deficient number, since it is larger than the sum of its proper divisors (6279532075).

521201155253 is an equidigital number, since it uses as much as digits as its factorization.

521201155253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6279532074.

The product of its (nonzero) digits is 15000, while the sum is 32.

Adding to 521201155253 its reverse (352551102125), we get a palindrome (873752257378).

The spelling of 521201155253 in words is "five hundred twenty-one billion, two hundred one million, one hundred fifty-five thousand, two hundred fifty-three".