197192421 has 8 divisors (see below), whose sum is σ = 292136960. Its totient is φ = 131461596.

The previous prime is 197192417. The next prime is 197192459. The reversal of 197192421 is 124291791.

It is not a de Polignac number, because 197192421 - 2² = 197192417 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 (197192461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3651685 + ... + 3651738.

It is an arithmetic number, because the mean of its divisors is an integer number (36517120).

Almost surely, 2^197192421 is an apocalyptic number.

It is an amenable number.

197192421 is a deficient number, since it is larger than the sum of its proper divisors (94944539).

197192421 is an equidigital number, since it uses as much as digits as its factorization.

197192421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7303432 (or 7303426 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 197192421 is about 14042.5218888916. The cubic root of 197192421 is about 582.0541718096.

The spelling of 197192421 in words is "one hundred ninety-seven million, one hundred ninety-two thousand, four hundred twenty-one".