521121121125 has 192 divisors, whose sum is σ = 995684901120. Its totient is φ = 241623360000.

The previous prime is 521121121123. The next prime is 521121121141.

521121121125 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 521121121125 - 2¹ = 521121121123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 521121121095 and 521121121104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521121121121) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 99050995 + ... + 99056255.

It is an arithmetic number, because the mean of its divisors is an integer number (5185858860).

Almost surely, 2^521121121125 is an apocalyptic number.

521121121125 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

521121121125 is a deficient number, since it is larger than the sum of its proper divisors (474563779995).

521121121125 is a wasteful number, since it uses less digits than its factorization.

521121121125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5397 (or 5376 counting only the distinct ones).

The product of its digits is 400, while the sum is 24.

It can be divided in two parts, 521121 and 121125, that added together give a palindrome (642246).

The spelling of 521121121125 in words is "five hundred twenty-one billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred twenty-five".