99421 has 6 divisors (see below), whose sum is σ = 115710. Its totient is φ = 85176.

The previous prime is 99409. The next prime is 99431. The reversal of 99421 is 12499.

It can be written as a sum of positive squares in only one way, i.e., 99225 + 196 = 315^2 + 14^2 .

It is not a de Polignac number, because 99421 - 2⁹ = 98909 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 966 + ... + 1063.

It is an arithmetic number, because the mean of its divisors is an integer number (19285).

2⁹⁹⁴²¹ is an apocalyptic number.

It is an amenable number.

99421 is a deficient number, since it is larger than the sum of its proper divisors (16289).

99421 is a wasteful number, since it uses less digits than its factorization.

99421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2043 (or 2036 counting only the distinct ones).

The product of its digits is 648, while the sum is 25.

The square root of 99421 is about 315.3109576275. The cubic root of 99421 is about 46.3261322188.

The spelling of 99421 in words is "ninety-nine thousand, four hundred twenty-one".