21204234202241 has 16 divisors (see below), whose sum is σ = 21897511311360. Its totient is φ = 20511538407360.

The previous prime is 21204234202157. The next prime is 21204234202247. The reversal of 21204234202241 is 14220243240212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21204234202241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21204234202247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1058666615 + ... + 1058686643.

It is an arithmetic number, because the mean of its divisors is an integer number (1368594456960).

Almost surely, 2^{21204234202241} is an apocalyptic number.

It is an amenable number.

21204234202241 is a deficient number, since it is larger than the sum of its proper divisors (693277109119).

21204234202241 is a wasteful number, since it uses less digits than its factorization.

21204234202241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32816.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 21204234202241 its reverse (14220243240212), we get a palindrome (35424477442453).

The spelling of 21204234202241 in words is "twenty-one trillion, two hundred four billion, two hundred thirty-four million, two hundred two thousand, two hundred forty-one".