2511260021 has 2 divisors, whose sum is σ = 2511260022. Its totient is φ = 2511260020.

The previous prime is 2511259999. The next prime is 2511260023. The reversal of 2511260021 is 1200621152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2295463921 + 215796100 = 47911^2 + 14690^2 .

It is a cyclic number.

It is not a de Polignac number, because 2511260021 - 2⁶ = 2511259957 is a prime.

It is a Sophie Germain prime.

Together with 2511260023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2511259975 and 2511260002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2511260023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1255630010 + 1255630011.

It is an arithmetic number, because the mean of its divisors is an integer number (1255630011).

Almost surely, 2^2511260021 is an apocalyptic number.

It is an amenable number.

2511260021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2511260021 is an equidigital number, since it uses as much as digits as its factorization.

2511260021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 2511260021 is about 50112.4737066531. The cubic root of 2511260021 is about 1359.2433833912.

Adding to 2511260021 its reverse (1200621152), we get a palindrome (3711881173).

The spelling of 2511260021 in words is "two billion, five hundred eleven million, two hundred sixty thousand, twenty-one".