9025000021 has 2 divisors, whose sum is σ = 9025000022. Its totient is φ = 9025000020.

The previous prime is 9025000009. The next prime is 9025000027. The reversal of 9025000021 is 1200005209.

9025000021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8628552100 + 396447921 = 92890^2 + 19911^2 .

It is a cyclic number.

It is not a de Polignac number, because 9025000021 - 2²³ = 9016611413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9025000027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4512500010 + 4512500011.

It is an arithmetic number, because the mean of its divisors is an integer number (4512500011).

Almost surely, 2^9025000021 is an apocalyptic number.

It is an amenable number.

9025000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

9025000021 is an equidigital number, since it uses as much as digits as its factorization.

9025000021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 9025000021 is about 95000.0001105263. Note that the first 3 decimals coincide. The cubic root of 9025000021 is about 2082.0080476170.

The spelling of 9025000021 in words is "nine billion, twenty-five million, twenty-one", and thus it is an aban number and an uban number.