121135521 has 32 divisors (see below), whose sum is σ = 180318208. Its totient is φ = 71850240.

The previous prime is 121135501. The next prime is 121135559. The reversal of 121135521 is 125531121.

It is not a de Polignac number, because 121135521 - 2⁹ = 121135009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121135501) 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, 182931 + ... + 183591.

It is an arithmetic number, because the mean of its divisors is an integer number (5634944).

Almost surely, 2^121135521 is an apocalyptic number.

It is an amenable number.

121135521 is a deficient number, since it is larger than the sum of its proper divisors (59182687).

121135521 is a wasteful number, since it uses less digits than its factorization.

121135521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841.

The product of its digits is 300, while the sum is 21.

The square root of 121135521 is about 11006.1583215943. The cubic root of 121135521 is about 494.7933307230.

Adding to 121135521 its reverse (125531121), we get a palindrome (246666642).

The spelling of 121135521 in words is "one hundred twenty-one million, one hundred thirty-five thousand, five hundred twenty-one".