9906021841 has 3 divisors (see below), whose sum is σ = 9906121371. Its totient is φ = 9905922312.

The previous prime is 9906021833. The next prime is 9906021893. The reversal of 9906021841 is 1481206099.

The square root of 9906021841 is 99529.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 551263441 + 9354758400 = 23479^2 + 96720^2 .

It is not a de Polignac number, because 9906021841 - 2³ = 9906021833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9906021794 and 9906021803.

It is not an unprimeable number, because it can be changed into a prime (9906027841) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 49765 + ... + 149293.

It is an arithmetic number, because the mean of its divisors is an integer number (3302040457).

Almost surely, 2^9906021841 is an apocalyptic number.

9906021841 is the 99529-th square number.

9906021841 is the 49765-th centered octagonal number.

It is an amenable number.

9906021841 is a deficient number, since it is larger than the sum of its proper divisors (99530).

9906021841 is an frugal number, since it uses more digits than its factorization.

9906021841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199058 (or 99529 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The cubic root of 9906021841 is about 2147.6644434919.

The spelling of 9906021841 in words is "nine billion, nine hundred six million, twenty-one thousand, eight hundred forty-one".