4857857670921 has 4 divisors (see below), whose sum is σ = 6477143561232. Its totient is φ = 3238571780612.

The previous prime is 4857857670889. The next prime is 4857857670923. The reversal of 4857857670921 is 1290767587584.

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 4857857670921 - 2⁵ = 4857857670889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4857857670923) 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, 809642945151 + ... + 809642945156.

It is an arithmetic number, because the mean of its divisors is an integer number (1619285890308).

Almost surely, 2^{4857857670921} is an apocalyptic number.

It is an amenable number.

4857857670921 is a deficient number, since it is larger than the sum of its proper divisors (1619285890311).

4857857670921 is a wasteful number, since it uses less digits than its factorization.

4857857670921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1619285890310.

The product of its (nonzero) digits is 237081600, while the sum is 69.

The spelling of 4857857670921 in words is "four trillion, eight hundred fifty-seven billion, eight hundred fifty-seven million, six hundred seventy thousand, nine hundred twenty-one".