2520357421 has 2 divisors, whose sum is σ = 2520357422. Its totient is φ = 2520357420.

The previous prime is 2520357419. The next prime is 2520357431. The reversal of 2520357421 is 1247530252.

2520357421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1875756100 + 644601321 = 43310^2 + 25389^2 .

It is a cyclic number.

It is not a de Polignac number, because 2520357421 - 2¹ = 2520357419 is a prime.

Together with 2520357419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2520357401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260178710 + 1260178711.

It is an arithmetic number, because the mean of its divisors is an integer number (1260178711).

Almost surely, 2^2520357421 is an apocalyptic number.

It is an amenable number.

2520357421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2520357421 is an equidigital number, since it uses as much as digits as its factorization.

2520357421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 2520357421 is about 50203.1614641947. The cubic root of 2520357421 is about 1360.8827568002.

Adding to 2520357421 its reverse (1247530252), we get a palindrome (3767887673).

The spelling of 2520357421 in words is "two billion, five hundred twenty million, three hundred fifty-seven thousand, four hundred twenty-one".