99836921 has 2 divisors, whose sum is σ = 99836922. Its totient is φ = 99836920.

The previous prime is 99836911. The next prime is 99836923. The reversal of 99836921 is 12963899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55428025 + 44408896 = 7445^2 + 6664^2 .

It is a cyclic number.

It is not a de Polignac number, because 99836921 - 2⁶ = 99836857 is a prime.

Together with 99836923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99836923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49918460 + 49918461.

It is an arithmetic number, because the mean of its divisors is an integer number (49918461).

Almost surely, 2^99836921 is an apocalyptic number.

It is an amenable number.

99836921 is a deficient number, since it is larger than the sum of its proper divisors (1).

99836921 is an equidigital number, since it uses as much as digits as its factorization.

99836921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 47.

The square root of 99836921 is about 9991.8427229415. The cubic root of 99836921 is about 463.9064308574.

The spelling of 99836921 in words is "ninety-nine million, eight hundred thirty-six thousand, nine hundred twenty-one".