4891110021 has 64 divisors (see below), whose sum is σ = 8423078400. Its totient is φ = 2747478528.

The previous prime is 4891109999. The next prime is 4891110041. The reversal of 4891110021 is 1200111984.

It is not a de Polignac number, because 4891110021 - 2¹⁰ = 4891108997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4891110041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2821471 + ... + 2823203.

It is an arithmetic number, because the mean of its divisors is an integer number (131610600).

Almost surely, 2^4891110021 is an apocalyptic number.

It is an amenable number.

4891110021 is a deficient number, since it is larger than the sum of its proper divisors (3531968379).

4891110021 is a wasteful number, since it uses less digits than its factorization.

4891110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1995 (or 1989 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 4891110021 is about 69936.4713221935. The cubic root of 4891110021 is about 1697.4714451973.

The spelling of 4891110021 in words is "four billion, eight hundred ninety-one million, one hundred ten thousand, twenty-one".