2057162721 has 4 divisors (see below), whose sum is σ = 2742883632. Its totient is φ = 1371441812.

The previous prime is 2057162717. The next prime is 2057162743. The reversal of 2057162721 is 1272617502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2057162721 - 2² = 2057162717 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2057162761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342860451 + ... + 342860456.

It is an arithmetic number, because the mean of its divisors is an integer number (685720908).

Almost surely, 2^2057162721 is an apocalyptic number.

It is an amenable number.

2057162721 is a deficient number, since it is larger than the sum of its proper divisors (685720911).

2057162721 is an equidigital number, since it uses as much as digits as its factorization.

2057162721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685720910.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 2057162721 is about 45355.9557390206. The cubic root of 2057162721 is about 1271.8118930679.

The spelling of 2057162721 in words is "two billion, fifty-seven million, one hundred sixty-two thousand, seven hundred twenty-one".