4921877821 has 16 divisors (see below), whose sum is σ = 5719267840. Its totient is φ = 4148282160.

The previous prime is 4921877797. The next prime is 4921877867. The reversal of 4921877821 is 1287781294.

It is a cyclic number.

It is not a de Polignac number, because 4921877821 - 2⁵ = 4921877789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4921877221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258610 + ... + 276988.

It is an arithmetic number, because the mean of its divisors is an integer number (357454240).

Almost surely, 2^4921877821 is an apocalyptic number.

It is an amenable number.

4921877821 is a deficient number, since it is larger than the sum of its proper divisors (797390019).

4921877821 is a wasteful number, since it uses less digits than its factorization.

4921877821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19024.

The product of its digits is 451584, while the sum is 49.

The square root of 4921877821 is about 70156.0961071809. The cubic root of 4921877821 is about 1701.0233539719.

The spelling of 4921877821 in words is "four billion, nine hundred twenty-one million, eight hundred seventy-seven thousand, eight hundred twenty-one".