2520126421 has 2 divisors, whose sum is σ = 2520126422. Its totient is φ = 2520126420.

The previous prime is 2520126379. The next prime is 2520126437. The reversal of 2520126421 is 1246210252.

2520126421 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., 1824485796 + 695640625 = 42714^2 + 26375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2520126421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2520126481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260063210 + 1260063211.

It is an arithmetic number, because the mean of its divisors is an integer number (1260063211).

Almost surely, 2^2520126421 is an apocalyptic number.

It is an amenable number.

2520126421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2520126421 is an equidigital number, since it uses as much as digits as its factorization.

2520126421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 2520126421 is about 50200.8607595527. The cubic root of 2520126421 is about 1360.8411788982.

Adding to 2520126421 its reverse (1246210252), we get a palindrome (3766336673).

The spelling of 2520126421 in words is "two billion, five hundred twenty million, one hundred twenty-six thousand, four hundred twenty-one".