2157071057 has 4 divisors (see below), whose sum is σ = 2159201460. Its totient is φ = 2154940656.

The previous prime is 2157071053. The next prime is 2157071071. The reversal of 2157071057 is 7501707512.

It is a happy number.

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 4946176 + 2152124881 = 2224^2 + 46391^2 .

It is a cyclic number.

It is not a de Polignac number, because 2157071057 - 2² = 2157071053 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157071053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1063682 + ... + 1065707.

It is an arithmetic number, because the mean of its divisors is an integer number (539800365).

Almost surely, 2^2157071057 is an apocalyptic number.

It is an amenable number.

2157071057 is a deficient number, since it is larger than the sum of its proper divisors (2130403).

2157071057 is a wasteful number, since it uses less digits than its factorization.

2157071057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2130402.

The product of its (nonzero) digits is 17150, while the sum is 35.

The square root of 2157071057 is about 46444.2790556598. The cubic root of 2157071057 is about 1292.0762704306.

Adding to 2157071057 its reverse (7501707512), we get a palindrome (9658778569).

The spelling of 2157071057 in words is "two billion, one hundred fifty-seven million, seventy-one thousand, fifty-seven".