8421658021 has 8 divisors (see below), whose sum is σ = 10131318080. Its totient is φ = 6838639488.

The previous prime is 8421658009. The next prime is 8421658061. The reversal of 8421658021 is 1208561248.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8421658021 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 (8421658061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31660236 + ... + 31660501.

It is an arithmetic number, because the mean of its divisors is an integer number (1266414760).

Almost surely, 2^8421658021 is an apocalyptic number.

It is an amenable number.

8421658021 is a deficient number, since it is larger than the sum of its proper divisors (1709660059).

8421658021 is a wasteful number, since it uses less digits than its factorization.

8421658021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63320763.

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 8421658021 is about 91769.5920280787. The cubic root of 8421658021 is about 2034.5382883606.

The spelling of 8421658021 in words is "eight billion, four hundred twenty-one million, six hundred fifty-eight thousand, twenty-one".