21197341 has 4 divisors (see below), whose sum is σ = 23124384. Its totient is φ = 19270300.

The previous prime is 21197327. The next prime is 21197353. The reversal of 21197341 is 14379112.

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 a de Polignac number, because none of the positive numbers 2^k-21197341 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 (21197311) 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, 963505 + ... + 963526.

It is an arithmetic number, because the mean of its divisors is an integer number (5781096).

Almost surely, 2^21197341 is an apocalyptic number.

It is an amenable number.

21197341 is a deficient number, since it is larger than the sum of its proper divisors (1927043).

21197341 is a wasteful number, since it uses less digits than its factorization.

21197341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1927042.

The product of its digits is 1512, while the sum is 28.

The square root of 21197341 is about 4604.0570152855. The cubic root of 21197341 is about 276.7539291843.

The spelling of 21197341 in words is "twenty-one million, one hundred ninety-seven thousand, three hundred forty-one".