521135157121 has 8 divisors (see below), whose sum is σ = 526699481000. Its totient is φ = 515574747648.

The previous prime is 521135157113. The next prime is 521135157143. The reversal of 521135157121 is 121751531125.

It can be written as a sum of positive squares in 4 ways, for example, as 484880400 + 520650276721 = 22020^2 + 721561^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 521135157121 - 2³ = 521135157113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521135157421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 710526 + ... + 1243831.

It is an arithmetic number, because the mean of its divisors is an integer number (65837435125).

Almost surely, 2^521135157121 is an apocalyptic number.

It is an amenable number.

521135157121 is a deficient number, since it is larger than the sum of its proper divisors (5564323879).

521135157121 is a wasteful number, since it uses less digits than its factorization.

521135157121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1957203.

The product of its digits is 10500, while the sum is 34.

Adding to 521135157121 its reverse (121751531125), we get a palindrome (642886688246).

The spelling of 521135157121 in words is "five hundred twenty-one billion, one hundred thirty-five million, one hundred fifty-seven thousand, one hundred twenty-one".