99984421 has 2 divisors, whose sum is σ = 99984422. Its totient is φ = 99984420.

The previous prime is 99984413. The next prime is 99984439. The reversal of 99984421 is 12448999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50211396 + 49773025 = 7086^2 + 7055^2 .

It is a cyclic number.

It is not a de Polignac number, because 99984421 - 2³ = 99984413 is a prime.

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 (99984461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49992210 + 49992211.

It is an arithmetic number, because the mean of its divisors is an integer number (49992211).

Almost surely, 2^99984421 is an apocalyptic number.

It is an amenable number.

99984421 is a deficient number, since it is larger than the sum of its proper divisors (1).

99984421 is an equidigital number, since it uses as much as digits as its factorization.

99984421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 46.

The square root of 99984421 is about 9999.2210196595. The cubic root of 99984421 is about 464.1347783386.

The spelling of 99984421 in words is "ninety-nine million, nine hundred eighty-four thousand, four hundred twenty-one".