9992002021 has 2 divisors, whose sum is σ = 9992002022. Its totient is φ = 9992002020.

The previous prime is 9992002019. The next prime is 9992002051. The reversal of 9992002021 is 1202002999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7803072225 + 2188929796 = 88335^2 + 46786^2 .

It is a cyclic number.

It is not a de Polignac number, because 9992002021 - 2¹ = 9992002019 is a prime.

Together with 9992002019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9992002051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4996001010 + 4996001011.

It is an arithmetic number, because the mean of its divisors is an integer number (4996001011).

Almost surely, 2^9992002021 is an apocalyptic number.

It is an amenable number.

9992002021 is a deficient number, since it is larger than the sum of its proper divisors (1).

9992002021 is an equidigital number, since it uses as much as digits as its factorization.

9992002021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 9992002021 is about 99960.0021058423. The cubic root of 9992002021 is about 2153.8601660567.

The spelling of 9992002021 in words is "nine billion, nine hundred ninety-two million, two thousand, twenty-one".