8429021 has 4 divisors (see below), whose sum is σ = 8473344. Its totient is φ = 8384700.

The previous prime is 8429011. The next prime is 8429051. The reversal of 8429021 is 1209248.

8429021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-8429021 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 (8429011) 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, 21875 + ... + 22256.

It is an arithmetic number, because the mean of its divisors is an integer number (2118336).

Almost surely, 2^8429021 is an apocalyptic number.

It is an amenable number.

8429021 is a deficient number, since it is larger than the sum of its proper divisors (44323).

8429021 is a wasteful number, since it uses less digits than its factorization.

8429021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44322.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 8429021 is about 2903.2776305410. The cubic root of 8429021 is about 203.5131041754.

The spelling of 8429021 in words is "eight million, four hundred twenty-nine thousand, twenty-one".