90421 has 4 divisors (see below), whose sum is σ = 95200. Its totient is φ = 85644.

The previous prime is 90407. The next prime is 90437. The reversal of 90421 is 12409.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 90421 - 2⁹ = 89909 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90395 and 90404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2361 + ... + 2398.

It is an arithmetic number, because the mean of its divisors is an integer number (23800).

2⁹⁰⁴²¹ is an apocalyptic number.

It is an amenable number.

90421 is a deficient number, since it is larger than the sum of its proper divisors (4779).

90421 is a wasteful number, since it uses less digits than its factorization.

90421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4778.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 90421 is about 300.7008480201. The cubic root of 90421 is about 44.8838155104.

The spelling of 90421 in words is "ninety thousand, four hundred twenty-one".