121512321 has 12 divisors (see below), whose sum is σ = 200591872. Its totient is φ = 69435576.

The previous prime is 121512317. The next prime is 121512337. The reversal of 121512321 is 123215121.

121512321 is a `hidden beast` number, since 121 + 512 + 32 + 1 = 666.

It is not a de Polignac number, because 121512321 - 2² = 121512317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121512294 and 121512303.

It is not an unprimeable number, because it can be changed into a prime (121512361) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 964321 + ... + 964446.

Almost surely, 2^121512321 is an apocalyptic number.

It is an amenable number.

121512321 is a deficient number, since it is larger than the sum of its proper divisors (79079551).

121512321 is a wasteful number, since it uses less digits than its factorization.

121512321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1928780 (or 1928777 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 121512321 is about 11023.2627202657. The cubic root of 121512321 is about 495.3058287624.

Adding to 121512321 its reverse (123215121), we get a palindrome (244727442).

The spelling of 121512321 in words is "one hundred twenty-one million, five hundred twelve thousand, three hundred twenty-one".