8512421 has 2 divisors, whose sum is σ = 8512422. Its totient is φ = 8512420.

The previous prime is 8512411. The next prime is 8512423. The reversal of 8512421 is 1242158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8491396 + 21025 = 2914^2 + 145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8512421 is a prime.

It is a super-2 number, since 2×8512421² = 144922622562482, which contains 22 as substring.

Together with 8512423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8512423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4256210 + 4256211.

It is an arithmetic number, because the mean of its divisors is an integer number (4256211).

Almost surely, 2^8512421 is an apocalyptic number.

It is an amenable number.

8512421 is a deficient number, since it is larger than the sum of its proper divisors (1).

8512421 is an equidigital number, since it uses as much as digits as its factorization.

8512421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 640, while the sum is 23.

The square root of 8512421 is about 2917.6053537105. The cubic root of 8512421 is about 204.1821150234.

Adding to 8512421 its reverse (1242158), we get a palindrome (9754579).

The spelling of 8512421 in words is "eight million, five hundred twelve thousand, four hundred twenty-one".