521020122553231 has 16 divisors (see below), whose sum is σ = 595617491490048. Its totient is φ = 446464239782400.

The previous prime is 521020122553201. The next prime is 521020122553253. The reversal of 521020122553231 is 132355221020125.

It is not a de Polignac number, because 521020122553231 - 2³¹ = 521017975069583 is a prime.

It is a super-2 number, since 2×521020122553231² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521020122553201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1291591236 + ... + 1291994566.

It is an arithmetic number, because the mean of its divisors is an integer number (37226093218128).

Almost surely, 2^{521020122553231} is an apocalyptic number.

521020122553231 is a deficient number, since it is larger than the sum of its proper divisors (74597368936817).

521020122553231 is a wasteful number, since it uses less digits than its factorization.

521020122553231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454302.

The product of its (nonzero) digits is 36000, while the sum is 34.

Adding to 521020122553231 its reverse (132355221020125), we get a palindrome (653375343573356).

The spelling of 521020122553231 in words is "five hundred twenty-one trillion, twenty billion, one hundred twenty-two million, five hundred fifty-three thousand, two hundred thirty-one".