2157000017 has 4 divisors (see below), whose sum is σ = 2158626816. Its totient is φ = 2155373220.

The previous prime is 2156999993. The next prime is 2157000029. The reversal of 2157000017 is 7100007512.

It is a happy number.

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 2157000017 - 2⁶ = 2156999953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2156999956 and 2157000001.

It is not an unprimeable number, because it can be changed into a prime (2157000217) 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, 811409 + ... + 814062.

It is an arithmetic number, because the mean of its divisors is an integer number (539656704).

Almost surely, 2^2157000017 is an apocalyptic number.

It is an amenable number.

2157000017 is a deficient number, since it is larger than the sum of its proper divisors (1626799).

2157000017 is a wasteful number, since it uses less digits than its factorization.

2157000017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1626798.

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

The square root of 2157000017 is about 46443.5142619505. The cubic root of 2157000017 is about 1292.0620860569.

Adding to 2157000017 its reverse (7100007512), we get a palindrome (9257007529).

The spelling of 2157000017 in words is "two billion, one hundred fifty-seven million, seventeen", and thus it is an aban number.