2057106721 has 4 divisors (see below), whose sum is σ = 2090829844. Its totient is φ = 2023383600.

The previous prime is 2057106719. The next prime is 2057106739. The reversal of 2057106721 is 1276017502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 133056225 + 1924050496 = 11535^2 + 43864^2 .

It is a cyclic number.

It is not a de Polignac number, because 2057106721 - 2¹ = 2057106719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2057106761) 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 in 3 ways as a sum of consecutive naturals, for example, 16861470 + ... + 16861591.

It is an arithmetic number, because the mean of its divisors is an integer number (522707461).

Almost surely, 2^2057106721 is an apocalyptic number.

It is an amenable number.

2057106721 is a deficient number, since it is larger than the sum of its proper divisors (33723123).

2057106721 is an equidigital number, since it uses as much as digits as its factorization.

2057106721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33723122.

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

The square root of 2057106721 is about 45355.3383958272. The cubic root of 2057106721 is about 1271.8003525592.

The spelling of 2057106721 in words is "two billion, fifty-seven million, one hundred six thousand, seven hundred twenty-one".