9012020021 has 8 divisors (see below), whose sum is σ = 9103269888. Its totient is φ = 8920810000.

The previous prime is 9012020009. The next prime is 9012020051. The reversal of 9012020021 is 1200202109.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9012020021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9012020051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 691556 + ... + 704466.

It is an arithmetic number, because the mean of its divisors is an integer number (1137908736).

Almost surely, 2^9012020021 is an apocalyptic number.

It is an amenable number.

9012020021 is a deficient number, since it is larger than the sum of its proper divisors (91249867).

9012020021 is a wasteful number, since it uses less digits than its factorization.

9012020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19923.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 9012020021 is about 94931.6597400467. The cubic root of 9012020021 is about 2081.0094352244.

The spelling of 9012020021 in words is "nine billion, twelve million, twenty thousand, twenty-one".