8997510421 has 2 divisors, whose sum is σ = 8997510422. Its totient is φ = 8997510420.

The previous prime is 8997510419. The next prime is 8997510451. The reversal of 8997510421 is 1240157998.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7909434225 + 1088076196 = 88935^2 + 32986^2 .

It is a cyclic number.

It is not a de Polignac number, because 8997510421 - 2¹ = 8997510419 is a prime.

Together with 8997510419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8997510451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4498755210 + 4498755211.

It is an arithmetic number, because the mean of its divisors is an integer number (4498755211).

Almost surely, 2^8997510421 is an apocalyptic number.

It is an amenable number.

8997510421 is a deficient number, since it is larger than the sum of its proper divisors (1).

8997510421 is an equidigital number, since it uses as much as digits as its factorization.

8997510421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 46.

The square root of 8997510421 is about 94855.2076641024. The cubic root of 8997510421 is about 2079.8920078455.

The spelling of 8997510421 in words is "eight billion, nine hundred ninety-seven million, five hundred ten thousand, four hundred twenty-one".