2106720751 has 2 divisors, whose sum is σ = 2106720752. Its totient is φ = 2106720750.

The previous prime is 2106720727. The next prime is 2106720761. The reversal of 2106720751 is 1570276012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2106720751 - 2¹⁵ = 2106687983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2106720761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1053360375 + 1053360376.

It is an arithmetic number, because the mean of its divisors is an integer number (1053360376).

Almost surely, 2^2106720751 is an apocalyptic number.

2106720751 is a deficient number, since it is larger than the sum of its proper divisors (1).

2106720751 is an equidigital number, since it uses as much as digits as its factorization.

2106720751 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 2106720751 is about 45899.0277783746. The cubic root of 2106720751 is about 1281.9438139954.

Adding to 2106720751 its reverse (1570276012), we get a palindrome (3676996763).

The spelling of 2106720751 in words is "two billion, one hundred six million, seven hundred twenty thousand, seven hundred fifty-one".