21484703821 has 4 divisors (see below), whose sum is σ = 24553947232. Its totient is φ = 18415460412.

The previous prime is 21484703797. The next prime is 21484703833. The reversal of 21484703821 is 12830748412.

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 21484703821 - 2²¹ = 21482606669 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 (21484703861) 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, 1534621695 + ... + 1534621708.

It is an arithmetic number, because the mean of its divisors is an integer number (6138486808).

Almost surely, 2^21484703821 is an apocalyptic number.

It is an amenable number.

21484703821 is a deficient number, since it is larger than the sum of its proper divisors (3069243411).

21484703821 is an equidigital number, since it uses as much as digits as its factorization.

21484703821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3069243410.

The product of its (nonzero) digits is 86016, while the sum is 40.

The spelling of 21484703821 in words is "twenty-one billion, four hundred eighty-four million, seven hundred three thousand, eight hundred twenty-one".