2521405334321 has 4 divisors (see below), whose sum is σ = 2582903025444. Its totient is φ = 2459907643200.

The previous prime is 2521405334293. The next prime is 2521405334353. The reversal of 2521405334321 is 1234335041252.

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 361725262096 + 2159680072225 = 601436^2 + 1469585^2 .

It is a cyclic number.

It is not a de Polignac number, because 2521405334321 - 2¹⁸ = 2521405072177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2521405334621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30748845500 + ... + 30748845581.

It is an arithmetic number, because the mean of its divisors is an integer number (645725756361).

Almost surely, 2^{2521405334321} is an apocalyptic number.

It is an amenable number.

2521405334321 is a deficient number, since it is larger than the sum of its proper divisors (61497691123).

2521405334321 is an equidigital number, since it uses as much as digits as its factorization.

2521405334321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61497691122.

The product of its (nonzero) digits is 86400, while the sum is 35.

The spelling of 2521405334321 in words is "two trillion, five hundred twenty-one billion, four hundred five million, three hundred thirty-four thousand, three hundred twenty-one".