8750021 has 4 divisors (see below), whose sum is σ = 10000032. Its totient is φ = 7500012.

The previous prime is 8750017. The next prime is 8750033. The reversal of 8750021 is 1200578.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1200578 = 2 ⋅600289.

It is a cyclic number.

It is not a de Polignac number, because 8750021 - 2² = 8750017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8750011) 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, 624995 + ... + 625008.

It is an arithmetic number, because the mean of its divisors is an integer number (2500008).

Almost surely, 2^8750021 is an apocalyptic number.

It is an amenable number.

8750021 is a deficient number, since it is larger than the sum of its proper divisors (1250011).

8750021 is a wasteful number, since it uses less digits than its factorization.

8750021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1250010.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 8750021 is about 2958.0434411955. The cubic root of 8750021 is about 206.0644298417.

Adding to 8750021 its reverse (1200578), we get a palindrome (9950599).

The spelling of 8750021 in words is "eight million, seven hundred fifty thousand, twenty-one".