4621813821 has 48 divisors (see below), whose sum is σ = 7355836800. Its totient is φ = 2783379456.

The previous prime is 4621813813. The next prime is 4621813871. The reversal of 4621813821 is 1283181264.

4621813821 is a `hidden beast` number, since 4 + 621 + 8 + 1 + 3 + 8 + 21 = 666.

It is not a de Polignac number, because 4621813821 - 2³ = 4621813813 is a prime.

It is a super-2 number, since 2×4621813821² = 42722325991973240082, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4621813811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1386685 + ... + 1390013.

It is an arithmetic number, because the mean of its divisors is an integer number (153246600).

Almost surely, 2^4621813821 is an apocalyptic number.

It is an amenable number.

4621813821 is a deficient number, since it is larger than the sum of its proper divisors (2734022979).

4621813821 is a wasteful number, since it uses less digits than its factorization.

4621813821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3730 (or 3727 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 4621813821 is about 67983.9232539576. The cubic root of 4621813821 is about 1665.7282413450.

The spelling of 4621813821 in words is "four billion, six hundred twenty-one million, eight hundred thirteen thousand, eight hundred twenty-one".