99976421 has 2 divisors, whose sum is σ = 99976422. Its totient is φ = 99976420.

The previous prime is 99976403. The next prime is 99976441. The reversal of 99976421 is 12467999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80748196 + 19228225 = 8986^2 + 4385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99976421 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99976441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49988210 + 49988211.

It is an arithmetic number, because the mean of its divisors is an integer number (49988211).

Almost surely, 2^99976421 is an apocalyptic number.

It is an amenable number.

99976421 is a deficient number, since it is larger than the sum of its proper divisors (1).

99976421 is an equidigital number, since it uses as much as digits as its factorization.

99976421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 47.

The square root of 99976421 is about 9998.8209804957. The cubic root of 99976421 is about 464.1223991526.

The spelling of 99976421 in words is "ninety-nine million, nine hundred seventy-six thousand, four hundred twenty-one".