9890012021 has 4 divisors (see below), whose sum is σ = 10471777452. Its totient is φ = 9308246592.

The previous prime is 9890012003. The next prime is 9890012063. The reversal of 9890012021 is 1202100989.

It is a happy number.

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 3148780996 + 6741231025 = 56114^2 + 82105^2 .

It is a cyclic number.

It is not a de Polignac number, because 9890012021 - 2²² = 9885817717 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 (9890012921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 290882690 + ... + 290882723.

It is an arithmetic number, because the mean of its divisors is an integer number (2617944363).

Almost surely, 2^9890012021 is an apocalyptic number.

It is an amenable number.

9890012021 is a deficient number, since it is larger than the sum of its proper divisors (581765431).

9890012021 is a wasteful number, since it uses less digits than its factorization.

9890012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581765430.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 9890012021 is about 99448.5395619262. The cubic root of 9890012021 is about 2146.5068223439.

The spelling of 9890012021 in words is "nine billion, eight hundred ninety million, twelve thousand, twenty-one".