9820037621 has 2 divisors, whose sum is σ = 9820037622. Its totient is φ = 9820037620.

The previous prime is 9820037561. The next prime is 9820037627. The reversal of 9820037621 is 1267300289.

9820037621 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., 9818035396 + 2002225 = 99086^2 + 1415^2 .

It is a cyclic number.

It is not a de Polignac number, because 9820037621 - 2¹⁸ = 9819775477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9820037627) 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, 4910018810 + 4910018811.

It is an arithmetic number, because the mean of its divisors is an integer number (4910018811).

Almost surely, 2^9820037621 is an apocalyptic number.

It is an amenable number.

9820037621 is a deficient number, since it is larger than the sum of its proper divisors (1).

9820037621 is an equidigital number, since it uses as much as digits as its factorization.

9820037621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 9820037621 is about 99096.1029556662. The cubic root of 9820037621 is about 2141.4324718590.

The spelling of 9820037621 in words is "nine billion, eight hundred twenty million, thirty-seven thousand, six hundred twenty-one".