2511012221 has 2 divisors, whose sum is σ = 2511012222. Its totient is φ = 2511012220.

The previous prime is 2511012209. The next prime is 2511012227. The reversal of 2511012221 is 1222101152.

2511012221 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., 2511012100 + 121 = 50110^2 + 11^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2511012221 is a prime.

It is a super-2 number, since 2×2511012221² = 12610364748022705682, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2511012221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2511012227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1255506110 + 1255506111.

It is an arithmetic number, because the mean of its divisors is an integer number (1255506111).

Almost surely, 2^2511012221 is an apocalyptic number.

It is an amenable number.

2511012221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2511012221 is an equidigital number, since it uses as much as digits as its factorization.

2511012221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 2511012221 is about 50110.0012073438. The cubic root of 2511012221 is about 1359.1986738845.

Adding to 2511012221 its reverse (1222101152), we get a palindrome (3733113373).

The spelling of 2511012221 in words is "two billion, five hundred eleven million, twelve thousand, two hundred twenty-one".