521221101122125 has 32 divisors (see below), whose sum is σ = 656278131824640. Its totient is φ = 413263075680000.

The previous prime is 521221101122101. The next prime is 521221101122129.

521221101122125 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 521221101122125 - 2¹⁹ = 521221100597837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 521221101122093 and 521221101122102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521221101122129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 246856636 + ... + 248959114.

It is an arithmetic number, because the mean of its divisors is an integer number (20508691619520).

Almost surely, 2^{521221101122125} is an apocalyptic number.

It is an amenable number.

521221101122125 is a deficient number, since it is larger than the sum of its proper divisors (135057030702515).

521221101122125 is a wasteful number, since it uses less digits than its factorization.

521221101122125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120158 (or 2120148 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 28.

It can be divided in two parts, 52122110 and 1122125, that added together give a palindrome (53244235).

The spelling of 521221101122125 in words is "five hundred twenty-one trillion, two hundred twenty-one billion, one hundred one million, one hundred twenty-two thousand, one hundred twenty-five".