2021007857 has 4 divisors (see below), whose sum is σ = 2204735856. Its totient is φ = 1837279860.

The previous prime is 2021007853. The next prime is 2021007881. The reversal of 2021007857 is 7587001202.

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 2021007857 - 2² = 2021007853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021007853) 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, 91863983 + ... + 91864004.

It is an arithmetic number, because the mean of its divisors is an integer number (551183964).

Almost surely, 2^2021007857 is an apocalyptic number.

It is an amenable number.

2021007857 is a deficient number, since it is larger than the sum of its proper divisors (183727999).

2021007857 is a wasteful number, since it uses less digits than its factorization.

2021007857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183727998.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 2021007857 is about 44955.6209722433. The cubic root of 2021007857 is about 1264.3170673586.

The spelling of 2021007857 in words is "two billion, twenty-one million, seven thousand, eight hundred fifty-seven".