21241097 has 4 divisors (see below), whose sum is σ = 21735120. Its totient is φ = 20747076.

The previous prime is 21241093. The next prime is 21241123. The reversal of 21241097 is 79014212.

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 21241097 - 2² = 21241093 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21241091) 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, 246947 + ... + 247032.

It is an arithmetic number, because the mean of its divisors is an integer number (5433780).

Almost surely, 2^21241097 is an apocalyptic number.

It is an amenable number.

21241097 is a deficient number, since it is larger than the sum of its proper divisors (494023).

21241097 is an equidigital number, since it uses as much as digits as its factorization.

21241097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494022.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 21241097 is about 4608.8064615473. The cubic root of 21241097 is about 276.9442254128.

The spelling of 21241097 in words is "twenty-one million, two hundred forty-one thousand, ninety-seven".