2651320121 has 2 divisors, whose sum is σ = 2651320122. Its totient is φ = 2651320120.

The previous prime is 2651320081. The next prime is 2651320123. The reversal of 2651320121 is 1210231562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2346433600 + 304886521 = 48440^2 + 17461^2 .

It is a cyclic number.

It is not a de Polignac number, because 2651320121 - 2¹⁸ = 2651057977 is a prime.

Together with 2651320123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2651320123) 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, 1325660060 + 1325660061.

It is an arithmetic number, because the mean of its divisors is an integer number (1325660061).

Almost surely, 2^2651320121 is an apocalyptic number.

It is an amenable number.

2651320121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2651320121 is an equidigital number, since it uses as much as digits as its factorization.

2651320121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 2651320121 is about 51490.9712571049. The cubic root of 2651320121 is about 1384.0572541455.

Adding to 2651320121 its reverse (1210231562), we get a palindrome (3861551683).

The spelling of 2651320121 in words is "two billion, six hundred fifty-one million, three hundred twenty thousand, one hundred twenty-one".