9389690021 has 2 divisors, whose sum is σ = 9389690022. Its totient is φ = 9389690020.

The previous prime is 9389690003. The next prime is 9389690041. The reversal of 9389690021 is 1200969839.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4912608100 + 4477081921 = 70090^2 + 66911^2 .

It is a cyclic number.

It is not a de Polignac number, because 9389690021 - 2⁶ = 9389689957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9389690041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4694845010 + 4694845011.

It is an arithmetic number, because the mean of its divisors is an integer number (4694845011).

Almost surely, 2^9389690021 is an apocalyptic number.

It is an amenable number.

9389690021 is a deficient number, since it is larger than the sum of its proper divisors (1).

9389690021 is an equidigital number, since it uses as much as digits as its factorization.

9389690021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 9389690021 is about 96900.4129041770. The cubic root of 9389690021 is about 2109.6824257189.

The spelling of 9389690021 in words is "nine billion, three hundred eighty-nine million, six hundred ninety thousand, twenty-one".