121534521 has 4 divisors (see below), whose sum is σ = 162046032. Its totient is φ = 81023012.

The previous prime is 121534519. The next prime is 121534531. The reversal of 121534521 is 125435121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121534521 - 2¹ = 121534519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121534491 and 121534500.

It is not an unprimeable number, because it can be changed into a prime (121534531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20255751 + ... + 20255756.

It is an arithmetic number, because the mean of its divisors is an integer number (40511508).

Almost surely, 2^121534521 is an apocalyptic number.

It is an amenable number.

121534521 is a deficient number, since it is larger than the sum of its proper divisors (40511511).

121534521 is an equidigital number, since it uses as much as digits as its factorization.

121534521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40511510.

The product of its digits is 1200, while the sum is 24.

The square root of 121534521 is about 11024.2696356720. The cubic root of 121534521 is about 495.3359906416.

Adding to 121534521 its reverse (125435121), we get a palindrome (246969642).

The spelling of 121534521 in words is "one hundred twenty-one million, five hundred thirty-four thousand, five hundred twenty-one".