21202241 has 4 divisors (see below), whose sum is σ = 21408192. Its totient is φ = 20996292.

The previous prime is 21202211. The next prime is 21202261. The reversal of 21202241 is 14220212.

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 21202241 - 2⁶ = 21202177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202201) 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, 102821 + ... + 103026.

It is an arithmetic number, because the mean of its divisors is an integer number (5352048).

Almost surely, 2^21202241 is an apocalyptic number.

It is an amenable number.

21202241 is a deficient number, since it is larger than the sum of its proper divisors (205951).

21202241 is a wasteful number, since it uses less digits than its factorization.

21202241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205950.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 21202241 is about 4604.5891239067. The cubic root of 21202241 is about 276.7752524527.

Adding to 21202241 its reverse (14220212), we get a palindrome (35422453).

The spelling of 21202241 in words is "twenty-one million, two hundred two thousand, two hundred forty-one".