121633521 has 8 divisors (see below), whose sum is σ = 171717984. Its totient is φ = 76319040.

The previous prime is 121633507. The next prime is 121633559. The reversal of 121633521 is 125336121.

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

It is not a de Polignac number, because 121633521 - 2⁵ = 121633489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121633491 and 121633500.

It is not an unprimeable number, because it can be changed into a prime (121632521) 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, 1192435 + ... + 1192536.

It is an arithmetic number, because the mean of its divisors is an integer number (21464748).

Almost surely, 2^121633521 is an apocalyptic number.

It is an amenable number.

121633521 is a deficient number, since it is larger than the sum of its proper divisors (50084463).

121633521 is a wasteful number, since it uses less digits than its factorization.

121633521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384991.

The product of its digits is 1080, while the sum is 24.

The square root of 121633521 is about 11028.7588150254. The cubic root of 121633521 is about 495.4704516255.

Adding to 121633521 its reverse (125336121), we get a palindrome (246969642).

The spelling of 121633521 in words is "one hundred twenty-one million, six hundred thirty-three thousand, five hundred twenty-one".