197421 has 24 divisors (see below), whose sum is σ = 328320. Its totient is φ = 104832.

The previous prime is 197419. The next prime is 197423. The reversal of 197421 is 124791.

It is an interprime number because it is at equal distance from previous prime (197419) and next prime (197423).

It is not a de Polignac number, because 197421 - 2¹ = 197419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 197391 and 197400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2460 + ... + 2538.

It is an arithmetic number, because the mean of its divisors is an integer number (13680).

2¹⁹⁷⁴²¹ is an apocalyptic number.

It is an amenable number.

197421 is a deficient number, since it is larger than the sum of its proper divisors (130899).

197421 is a wasteful number, since it uses less digits than its factorization.

197421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113 (or 106 counting only the distinct ones).

The product of its digits is 504, while the sum is 24.

The square root of 197421 is about 444.3208300316. The cubic root of 197421 is about 58.2278984348.

The spelling of 197421 in words is "one hundred ninety-seven thousand, four hundred twenty-one".