2521402321 has 2 divisors, whose sum is σ = 2521402322. Its totient is φ = 2521402320.

The previous prime is 2521402313. The next prime is 2521402343. The reversal of 2521402321 is 1232041252.

It is a happy number.

It is an a-pointer prime, because the next prime (2521402343) can be obtained adding 2521402321 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2488912321 + 32490000 = 49889^2 + 5700^2 .

It is a cyclic number.

It is not a de Polignac number, because 2521402321 - 2³ = 2521402313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2521402292 and 2521402301.

It is not a weakly prime, because it can be changed into another prime (2521402421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260701160 + 1260701161.

It is an arithmetic number, because the mean of its divisors is an integer number (1260701161).

Almost surely, 2^2521402321 is an apocalyptic number.

It is an amenable number.

2521402321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2521402321 is an equidigital number, since it uses as much as digits as its factorization.

2521402321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 2521402321 is about 50213.5671009340. The cubic root of 2521402321 is about 1361.0707975803.

Adding to 2521402321 its reverse (1232041252), we get a palindrome (3753443573).

The spelling of 2521402321 in words is "two billion, five hundred twenty-one million, four hundred two thousand, three hundred twenty-one".