9812120321 has 8 divisors (see below), whose sum is σ = 10246623360. Its totient is φ = 9378274752.

The previous prime is 9812120303. The next prime is 9812120387. The reversal of 9812120321 is 1230212189.

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

It is a cyclic number.

It is not a de Polignac number, because 9812120321 - 2²² = 9807926017 is a prime.

It is a super-2 number, since 2×9812120321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9812120221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133736 + ... + 193673.

It is an arithmetic number, because the mean of its divisors is an integer number (1280827920).

Almost surely, 2^9812120321 is an apocalyptic number.

It is an amenable number.

9812120321 is a deficient number, since it is larger than the sum of its proper divisors (434503039).

9812120321 is a wasteful number, since it uses less digits than its factorization.

9812120321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328735.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 9812120321 is about 99056.1473155503. The cubic root of 9812120321 is about 2140.8568148052.

The spelling of 9812120321 in words is "nine billion, eight hundred twelve million, one hundred twenty thousand, three hundred twenty-one".