8451021 has 4 divisors (see below), whose sum is σ = 11268032. Its totient is φ = 5634012.

The previous prime is 8451019. The next prime is 8451041. The reversal of 8451021 is 1201548.

8451021 is digitally balanced in base 2 and base 3, because in such bases 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 not a de Polignac number, because 8451021 - 2¹ = 8451019 is a prime.

It is a super-3 number, since 3×8451021³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8451041) 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, 1408501 + ... + 1408506.

It is an arithmetic number, because the mean of its divisors is an integer number (2817008).

Almost surely, 2^8451021 is an apocalyptic number.

It is an amenable number.

8451021 is a deficient number, since it is larger than the sum of its proper divisors (2817011).

8451021 is a wasteful number, since it uses less digits than its factorization.

8451021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2817010.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 8451021 is about 2907.0639827840. The cubic root of 8451021 is about 203.6900088102.

Adding to 8451021 its reverse (1201548), we get a palindrome (9652569).

The spelling of 8451021 in words is "eight million, four hundred fifty-one thousand, twenty-one".