192421 has 4 divisors (see below), whose sum is σ = 193612. Its totient is φ = 191232.

The previous prime is 192407. The next prime is 192431. The reversal of 192421 is 124291.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 108900 + 83521 = 330^2 + 289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-192421 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 (192431) 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, 306 + ... + 691.

It is an arithmetic number, because the mean of its divisors is an integer number (48403).

2¹⁹²⁴²¹ is an apocalyptic number.

It is an amenable number.

192421 is a deficient number, since it is larger than the sum of its proper divisors (1191).

192421 is an equidigital number, since it uses as much as digits as its factorization.

192421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1190.

The product of its digits is 144, while the sum is 19.

The square root of 192421 is about 438.6581812756. The cubic root of 192421 is about 57.7321177994.

It can be divided in two parts, 1924 and 21, that multiplied together give a palindrome (40404).

The spelling of 192421 in words is "one hundred ninety-two thousand, four hundred twenty-one".