2129851057 has 4 divisors (see below), whose sum is σ = 2170036980. Its totient is φ = 2089665136.

The previous prime is 2129851027. The next prime is 2129851093. The reversal of 2129851057 is 7501589212.

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 1946221456 + 183629601 = 44116^2 + 13551^2 .

It is a cyclic number.

It is not a de Polignac number, because 2129851057 - 2¹¹ = 2129849009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2129851027) 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, 20092882 + ... + 20092987.

It is an arithmetic number, because the mean of its divisors is an integer number (542509245).

Almost surely, 2^2129851057 is an apocalyptic number.

It is an amenable number.

2129851057 is a deficient number, since it is larger than the sum of its proper divisors (40185923).

2129851057 is an equidigital number, since it uses as much as digits as its factorization.

2129851057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40185922.

The product of its (nonzero) digits is 50400, while the sum is 40.

The square root of 2129851057 is about 46150.3093922457. The cubic root of 2129851057 is about 1286.6183603423.

The spelling of 2129851057 in words is "two billion, one hundred twenty-nine million, eight hundred fifty-one thousand, fifty-seven".