99943421 has 4 divisors (see below), whose sum is σ = 99963612. Its totient is φ = 99923232.

The previous prime is 99943409. The next prime is 99943433. The reversal of 99943421 is 12434999.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (99943409) and next prime (99943433).

It can be written as a sum of positive squares in 2 ways, for example, as 27931225 + 72012196 = 5285^2 + 8486^2 .

It is a cyclic number.

It is not a de Polignac number, because 99943421 - 2¹⁰ = 99942397 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 (99943621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2945 + ... + 14441.

It is an arithmetic number, because the mean of its divisors is an integer number (24990903).

Almost surely, 2^99943421 is an apocalyptic number.

It is an amenable number.

99943421 is a deficient number, since it is larger than the sum of its proper divisors (20191).

99943421 is a wasteful number, since it uses less digits than its factorization.

99943421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20190.

The product of its digits is 69984, while the sum is 41.

The square root of 99943421 is about 9997.1706497389. The cubic root of 99943421 is about 464.0713280284.

The spelling of 99943421 in words is "ninety-nine million, nine hundred forty-three thousand, four hundred twenty-one".