9841861021 has 4 divisors (see below), whose sum is σ = 9844139872. Its totient is φ = 9839582172.

The previous prime is 9841861013. The next prime is 9841861033. The reversal of 9841861021 is 1201681489.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9841861021 - 2³ = 9841861013 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 (9841861061) 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, 1132935 + ... + 1141588.

It is an arithmetic number, because the mean of its divisors is an integer number (2461034968).

Almost surely, 2^9841861021 is an apocalyptic number.

It is an amenable number.

9841861021 is a deficient number, since it is larger than the sum of its proper divisors (2278851).

9841861021 is a wasteful number, since it uses less digits than its factorization.

9841861021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278850.

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 9841861021 is about 99206.1541488228. The cubic root of 9841861021 is about 2143.0176240029.

The spelling of 9841861021 in words is "nine billion, eight hundred forty-one million, eight hundred sixty-one thousand, twenty-one".