2143822857 has 16 divisors (see below), whose sum is σ = 3169410240. Its totient is φ = 1277985600.

The previous prime is 2143822841. The next prime is 2143822871. The reversal of 2143822857 is 7582283412.

It is not a de Polignac number, because 2143822857 - 2⁴ = 2143822841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2143822657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 530482 + ... + 534507.

It is an arithmetic number, because the mean of its divisors is an integer number (198088140).

Almost surely, 2^2143822857 is an apocalyptic number.

It is an amenable number.

2143822857 is a deficient number, since it is larger than the sum of its proper divisors (1025587383).

2143822857 is a wasteful number, since it uses less digits than its factorization.

2143822857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065064.

The product of its digits is 215040, while the sum is 42.

The square root of 2143822857 is about 46301.4347185916. The cubic root of 2143822857 is about 1289.4256315686.

The spelling of 2143822857 in words is "two billion, one hundred forty-three million, eight hundred twenty-two thousand, eight hundred fifty-seven".