2521634122421 has 2 divisors, whose sum is σ = 2521634122422. Its totient is φ = 2521634122420.

The previous prime is 2521634122369. The next prime is 2521634122471. The reversal of 2521634122421 is 1242214361252.

2521634122421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2043510276196 + 478123846225 = 1429514^2 + 691465^2 .

It is a cyclic number.

It is not a de Polignac number, because 2521634122421 - 2¹⁰ = 2521634121397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2521634122471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260817061210 + 1260817061211.

It is an arithmetic number, because the mean of its divisors is an integer number (1260817061211).

Almost surely, 2^{2521634122421} is an apocalyptic number.

It is an amenable number.

2521634122421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2521634122421 is an equidigital number, since it uses as much as digits as its factorization.

2521634122421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46080, while the sum is 35.

Adding to 2521634122421 its reverse (1242214361252), we get a palindrome (3763848483673).

The spelling of 2521634122421 in words is "two trillion, five hundred twenty-one billion, six hundred thirty-four million, one hundred twenty-two thousand, four hundred twenty-one".