2621016521 has 2 divisors, whose sum is σ = 2621016522. Its totient is φ = 2621016520.

The previous prime is 2621016493. The next prime is 2621016527. The reversal of 2621016521 is 1256101262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1555908025 + 1065108496 = 39445^2 + 32636^2 .

It is a cyclic number.

It is not a de Polignac number, because 2621016521 - 2⁶ = 2621016457 is a prime.

It is not a weakly prime, because it can be changed into another prime (2621016527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1310508260 + 1310508261.

It is an arithmetic number, because the mean of its divisors is an integer number (1310508261).

Almost surely, 2^2621016521 is an apocalyptic number.

It is an amenable number.

2621016521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2621016521 is an equidigital number, since it uses as much as digits as its factorization.

2621016521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 2621016521 is about 51195.8642958589. The cubic root of 2621016521 is about 1378.7639497502.

Adding to 2621016521 its reverse (1256101262), we get a palindrome (3877117783).

The spelling of 2621016521 in words is "two billion, six hundred twenty-one million, sixteen thousand, five hundred twenty-one".