2121424321 has 2 divisors, whose sum is σ = 2121424322. Its totient is φ = 2121424320.

The previous prime is 2121424273. The next prime is 2121424351. The reversal of 2121424321 is 1234241212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1220524096 + 900900225 = 34936^2 + 30015^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121424321 - 2²¹ = 2119327169 is a prime.

It is a super-2 number, since 2×2121424321² = 9000882299460622082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2121424292 and 2121424301.

It is not a weakly prime, because it can be changed into another prime (2121424351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060712160 + 1060712161.

It is an arithmetic number, because the mean of its divisors is an integer number (1060712161).

Almost surely, 2^2121424321 is an apocalyptic number.

It is an amenable number.

2121424321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121424321 is an equidigital number, since it uses as much as digits as its factorization.

2121424321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 22.

The square root of 2121424321 is about 46058.9222735400. The cubic root of 2121424321 is about 1284.9192863655.

Adding to 2121424321 its reverse (1234241212), we get a palindrome (3355665533).

The spelling of 2121424321 in words is "two billion, one hundred twenty-one million, four hundred twenty-four thousand, three hundred twenty-one".