99942421 has 2 divisors, whose sum is σ = 99942422. Its totient is φ = 99942420.

The previous prime is 99942407. The next prime is 99942457. The reversal of 99942421 is 12424999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75082225 + 24860196 = 8665^2 + 4986^2 .

It is a cyclic number.

It is not a de Polignac number, because 99942421 - 2⁹ = 99941909 is a prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99942121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49971210 + 49971211.

It is an arithmetic number, because the mean of its divisors is an integer number (49971211).

Almost surely, 2^99942421 is an apocalyptic number.

It is an amenable number.

99942421 is a deficient number, since it is larger than the sum of its proper divisors (1).

99942421 is an equidigital number, since it uses as much as digits as its factorization.

99942421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 40.

The square root of 99942421 is about 9997.1206354630. The cubic root of 99942421 is about 464.0697802430.

The spelling of 99942421 in words is "ninety-nine million, nine hundred forty-two thousand, four hundred twenty-one".