2505011021 has 2 divisors, whose sum is σ = 2505011022. Its totient is φ = 2505011020.

The previous prime is 2505010943. The next prime is 2505011023. The reversal of 2505011021 is 1201105052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1869265225 + 635745796 = 43235^2 + 25214^2 .

It is a cyclic number.

It is not a de Polignac number, because 2505011021 - 2³⁰ = 1431269197 is a prime.

Together with 2505011023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2505011023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1252505510 + 1252505511.

It is an arithmetic number, because the mean of its divisors is an integer number (1252505511).

Almost surely, 2^2505011021 is an apocalyptic number.

It is an amenable number.

2505011021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2505011021 is an equidigital number, since it uses as much as digits as its factorization.

2505011021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 2505011021 is about 50050.0851248027. The cubic root of 2505011021 is about 1358.1150033505.

Adding to 2505011021 its reverse (1201105052), we get a palindrome (3706116073).

The spelling of 2505011021 in words is "two billion, five hundred five million, eleven thousand, twenty-one".