121533564 has 24 divisors (see below), whose sum is σ = 295908480. Its totient is φ = 38749744.

The previous prime is 121533487. The next prime is 121533613. The reversal of 121533564 is 465335121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219894 + ... + 220445.

It is an arithmetic number, because the mean of its divisors is an integer number (12329520).

Almost surely, 2^121533564 is an apocalyptic number.

It is an amenable number.

121533564 is an abundant number, since it is smaller than the sum of its proper divisors (174374916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121533564 is a wasteful number, since it uses less digits than its factorization.

121533564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440369 (or 440367 counting only the distinct ones).

The product of its digits is 10800, while the sum is 30.

The square root of 121533564 is about 11024.2262313507. The cubic root of 121533564 is about 495.3346904958.

Adding to 121533564 its reverse (465335121), we get a palindrome (586868685).

The spelling of 121533564 in words is "one hundred twenty-one million, five hundred thirty-three thousand, five hundred sixty-four".