4821187421 has 4 divisors (see below), whose sum is σ = 4821327612. Its totient is φ = 4821047232.

The previous prime is 4821187409. The next prime is 4821187507. The reversal of 4821187421 is 1247811284.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4679244025 + 141943396 = 68405^2 + 11914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4821187421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4821187121) 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, 20651 + ... + 100343.

It is an arithmetic number, because the mean of its divisors is an integer number (1205331903).

Almost surely, 2^4821187421 is an apocalyptic number.

It is an amenable number.

4821187421 is a deficient number, since it is larger than the sum of its proper divisors (140191).

4821187421 is an equidigital number, since it uses as much as digits as its factorization.

4821187421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140190.

The product of its digits is 28672, while the sum is 38.

The square root of 4821187421 is about 69434.7709796756. The cubic root of 4821187421 is about 1689.3436547719.

The spelling of 4821187421 in words is "four billion, eight hundred twenty-one million, one hundred eighty-seven thousand, four hundred twenty-one".