2157071 has 4 divisors (see below), whose sum is σ = 2465232. Its totient is φ = 1848912.

The previous prime is 2157041. The next prime is 2157091. The reversal of 2157071 is 1707512.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2157071 - 2⁶ = 2157007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157031) 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, 154070 + ... + 154083.

It is an arithmetic number, because the mean of its divisors is an integer number (616308).

2^2157071 is an apocalyptic number.

2157071 is a deficient number, since it is larger than the sum of its proper divisors (308161).

2157071 is an equidigital number, since it uses as much as digits as its factorization.

2157071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308160.

The product of its (nonzero) digits is 490, while the sum is 23.

The square root of 2157071 is about 1468.6970415984. The cubic root of 2157071 is about 129.2076259050.

The spelling of 2157071 in words is "two million, one hundred fifty-seven thousand, seventy-one".