9970808021 has 4 divisors (see below), whose sum is σ = 9971021772. Its totient is φ = 9970594272.

The previous prime is 9970808017. The next prime is 9970808041. The reversal of 9970808021 is 1208080799.

9970808021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3224649796 + 6746158225 = 56786^2 + 82135^2 .

It is a cyclic number.

It is not a de Polignac number, because 9970808021 - 2² = 9970808017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9970808041) 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 in 3 ways as a sum of consecutive naturals, for example, 3710 + ... + 141263.

It is an arithmetic number, because the mean of its divisors is an integer number (2492755443).

Almost surely, 2^9970808021 is an apocalyptic number.

It is an amenable number.

9970808021 is a deficient number, since it is larger than the sum of its proper divisors (213751).

9970808021 is a wasteful number, since it uses less digits than its factorization.

9970808021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213750.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 9970808021 is about 99853.9334277824. The cubic root of 9970808021 is about 2152.3362397004.

The spelling of 9970808021 in words is "nine billion, nine hundred seventy million, eight hundred eight thousand, twenty-one".