8712547421 has 2 divisors, whose sum is σ = 8712547422. Its totient is φ = 8712547420.

The previous prime is 8712547373. The next prime is 8712547423. The reversal of 8712547421 is 1247452178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6949723225 + 1762824196 = 83365^2 + 41986^2 .

It is a cyclic number.

It is not a de Polignac number, because 8712547421 - 2³⁰ = 7638805597 is a prime.

Together with 8712547423, 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 (8712547423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4356273710 + 4356273711.

It is an arithmetic number, because the mean of its divisors is an integer number (4356273711).

Almost surely, 2^8712547421 is an apocalyptic number.

It is an amenable number.

8712547421 is a deficient number, since it is larger than the sum of its proper divisors (1).

8712547421 is an equidigital number, since it uses as much as digits as its factorization.

8712547421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 125440, while the sum is 41.

The square root of 8712547421 is about 93341.0275334485. The cubic root of 8712547421 is about 2057.6983925031.

Adding to 8712547421 its reverse (1247452178), we get a palindrome (9959999599).

The spelling of 8712547421 in words is "eight billion, seven hundred twelve million, five hundred forty-seven thousand, four hundred twenty-one".