121424321 has 4 divisors (see below), whose sum is σ = 122626644. Its totient is φ = 120222000.

The previous prime is 121424297. The next prime is 121424357. The reversal of 121424321 is 123424121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54184321 + 67240000 = 7361^2 + 8200^2 .

It is a cyclic number.

It is not a de Polignac number, because 121424321 - 2¹⁰ = 121423297 is a prime.

It is a super-2 number, since 2×121424321² = 29487731460622082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121424293 and 121424302.

It is not an unprimeable number, because it can be changed into a prime (121424021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 601010 + ... + 601211.

It is an arithmetic number, because the mean of its divisors is an integer number (30656661).

Almost surely, 2^121424321 is an apocalyptic number.

It is an amenable number.

121424321 is a deficient number, since it is larger than the sum of its proper divisors (1202323).

121424321 is a wasteful number, since it uses less digits than its factorization.

121424321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202322.

The product of its digits is 384, while the sum is 20.

The square root of 121424321 is about 11019.2704386452. The cubic root of 121424321 is about 495.1862320039.

Adding to 121424321 its reverse (123424121), we get a palindrome (244848442).

The spelling of 121424321 in words is "one hundred twenty-one million, four hundred twenty-four thousand, three hundred twenty-one".