8891021 has 4 divisors (see below), whose sum is σ = 8972700. Its totient is φ = 8809344.

The previous prime is 8891009. The next prime is 8891033. The reversal of 8891021 is 1201988.

8891021 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.

It is an interprime number because it is at equal distance from previous prime (8891009) and next prime (8891033).

It can be written as a sum of positive squares in 2 ways, for example, as 2515396 + 6375625 = 1586^2 + 2525^2 .

It is a cyclic number.

It is not a de Polignac number, because 8891021 - 2¹⁴ = 8874637 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 (8891621) 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, 40676 + ... + 40893.

It is an arithmetic number, because the mean of its divisors is an integer number (2243175).

Almost surely, 2^8891021 is an apocalyptic number.

It is an amenable number.

8891021 is a deficient number, since it is larger than the sum of its proper divisors (81679).

8891021 is a wasteful number, since it uses less digits than its factorization.

8891021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81678.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 8891021 is about 2981.7815144641. The cubic root of 8891021 is about 207.1653948186.

The spelling of 8891021 in words is "eight million, eight hundred ninety-one thousand, twenty-one".