8402284021 has 4 divisors (see below), whose sum is σ = 8540026444. Its totient is φ = 8264541600.

The previous prime is 8402283997. The next prime is 8402284027. The reversal of 8402284021 is 1204822048.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2372761521 + 6029522500 = 48711^2 + 77650^2 .

It is a cyclic number.

It is not a de Polignac number, because 8402284021 - 2⁹ = 8402283509 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 (8402284027) 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, 68871120 + ... + 68871241.

It is an arithmetic number, because the mean of its divisors is an integer number (2135006611).

Almost surely, 2^8402284021 is an apocalyptic number.

It is an amenable number.

8402284021 is a deficient number, since it is larger than the sum of its proper divisors (137742423).

8402284021 is a wasteful number, since it uses less digits than its factorization.

8402284021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137742422.

The product of its (nonzero) digits is 8192, while the sum is 31.

The square root of 8402284021 is about 91663.9734083135. The cubic root of 8402284021 is about 2032.9769406334.

The spelling of 8402284021 in words is "eight billion, four hundred two million, two hundred eighty-four thousand, twenty-one".