121521236 has 24 divisors (see below), whose sum is σ = 234964800. Its totient is φ = 54699392.

The previous prime is 121521221. The next prime is 121521241. The reversal of 121521236 is 632125121.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37286 + ... + 40413.

It is an arithmetic number, because the mean of its divisors is an integer number (9790200).

Almost surely, 2^121521236 is an apocalyptic number.

It is an amenable number.

121521236 is a deficient number, since it is larger than the sum of its proper divisors (113443564).

121521236 is a wasteful number, since it uses less digits than its factorization.

121521236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77743 (or 77741 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

The square root of 121521236 is about 11023.6670849586. The cubic root of 121521236 is about 495.3179415080.

Adding to 121521236 its reverse (632125121), we get a palindrome (753646357).

The spelling of 121521236 in words is "one hundred twenty-one million, five hundred twenty-one thousand, two hundred thirty-six".