21211302241 has 4 divisors (see below), whose sum is σ = 21662606592. Its totient is φ = 20759997892.

The previous prime is 21211302209. The next prime is 21211302269. The reversal of 21211302241 is 14220311212.

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 21211302241 - 2⁵ = 21211302209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211302041) 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, 225652105 + ... + 225652198.

It is an arithmetic number, because the mean of its divisors is an integer number (5415651648).

Almost surely, 2^21211302241 is an apocalyptic number.

It is an amenable number.

21211302241 is a deficient number, since it is larger than the sum of its proper divisors (451304351).

21211302241 is an equidigital number, since it uses as much as digits as its factorization.

21211302241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451304350.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21211302241 its reverse (14220311212), we get a palindrome (35431613453).

The spelling of 21211302241 in words is "twenty-one billion, two hundred eleven million, three hundred two thousand, two hundred forty-one".