9648860021 has 2 divisors, whose sum is σ = 9648860022. Its totient is φ = 9648860020.

The previous prime is 9648859991. The next prime is 9648860063. The reversal of 9648860021 is 1200688469.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6097891921 + 3550968100 = 78089^2 + 59590^2 .

It is a cyclic number.

It is not a de Polignac number, because 9648860021 - 2¹⁴ = 9648843637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9648860521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4824430010 + 4824430011.

It is an arithmetic number, because the mean of its divisors is an integer number (4824430011).

Almost surely, 2^9648860021 is an apocalyptic number.

It is an amenable number.

9648860021 is a deficient number, since it is larger than the sum of its proper divisors (1).

9648860021 is an equidigital number, since it uses as much as digits as its factorization.

9648860021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 9648860021 is about 98228.6110102347. The cubic root of 9648860021 is about 2128.9166996078.

The spelling of 9648860021 in words is "nine billion, six hundred forty-eight million, eight hundred sixty thousand, twenty-one".