2521262021 has 2 divisors, whose sum is σ = 2521262022. Its totient is φ = 2521262020.

The previous prime is 2521262017. The next prime is 2521262071. The reversal of 2521262021 is 1202621252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2276339521 + 244922500 = 47711^2 + 15650^2 .

It is a cyclic number.

It is not a de Polignac number, because 2521262021 - 2² = 2521262017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2521262071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260631010 + 1260631011.

It is an arithmetic number, because the mean of its divisors is an integer number (1260631011).

Almost surely, 2^2521262021 is an apocalyptic number.

It is an amenable number.

2521262021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2521262021 is an equidigital number, since it uses as much as digits as its factorization.

2521262021 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 23.

The square root of 2521262021 is about 50212.1700487043. The cubic root of 2521262021 is about 1361.0455521348.

Adding to 2521262021 its reverse (1202621252), we get a palindrome (3723883273).

The spelling of 2521262021 in words is "two billion, five hundred twenty-one million, two hundred sixty-two thousand, twenty-one".