121232421 has 24 divisors (see below), whose sum is σ = 178007544. Its totient is φ = 79497600.

The previous prime is 121232401. The next prime is 121232453. The reversal of 121232421 is 124232121.

It is a happy number.

121232421 is a `hidden beast` number, since 1 + 212 + 32 + 421 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 115992900 + 5239521 = 10770^2 + 2289^2 .

It is not a de Polignac number, because 121232421 - 2⁶ = 121232357 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121232394 and 121232403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121232401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 178735 + ... + 179411.

It is an arithmetic number, because the mean of its divisors is an integer number (7416981).

Almost surely, 2^121232421 is an apocalyptic number.

It is an amenable number.

121232421 is a deficient number, since it is larger than the sum of its proper divisors (56775123).

121232421 is a wasteful number, since it uses less digits than its factorization.

121232421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981 (or 978 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 121232421 is about 11010.5595225674. The cubic root of 121232421 is about 494.9252289878.

Adding to 121232421 its reverse (124232121), we get a palindrome (245464542).

It can be divided in two parts, 1212 and 32421, that added together give a palindrome (33633).

The spelling of 121232421 in words is "one hundred twenty-one million, two hundred thirty-two thousand, four hundred twenty-one".