521122221125 has 64 divisors (see below), whose sum is σ = 742582923264. Its totient is φ = 361417320000.

The previous prime is 521122221119. The next prime is 521122221131.

521122221125 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (521122221119) and next prime (521122221131).

It is not a de Polignac number, because 521122221125 - 2¹⁴ = 521122204741 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 521122221094 and 521122221103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10442984 + ... + 10492766.

It is an arithmetic number, because the mean of its divisors is an integer number (11602858176).

Almost surely, 2^521122221125 is an apocalyptic number.

521122221125 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

521122221125 is a deficient number, since it is larger than the sum of its proper divisors (221460702139).

521122221125 is a wasteful number, since it uses less digits than its factorization.

521122221125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50163 (or 50153 counting only the distinct ones).

The product of its digits is 1600, while the sum is 26.

It can be divided in two parts, 521122 and 221125, that added together give a palindrome (742247).

The spelling of 521122221125 in words is "five hundred twenty-one billion, one hundred twenty-two million, two hundred twenty-one thousand, one hundred twenty-five".