21221201222204 has 24 divisors (see below), whose sum is σ = 37520281211280. Its totient is φ = 10501122756096.

The previous prime is 21221201222203. The next prime is 21221201222251. The reversal of 21221201222204 is 40222210212212.

It is a self number, because there is not a number n which added to its sum of digits gives 21221201222204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221201222201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82296827 + ... + 82554285.

It is an arithmetic number, because the mean of its divisors is an integer number (1563345050470).

Almost surely, 2^{21221201222204} is an apocalyptic number.

It is an amenable number.

21221201222204 is a deficient number, since it is larger than the sum of its proper divisors (16299079989076).

21221201222204 is a wasteful number, since it uses less digits than its factorization.

21221201222204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469997 (or 469995 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21221201222204 its reverse (40222210212212), we get a palindrome (61443411434416).

The spelling of 21221201222204 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred one million, two hundred twenty-two thousand, two hundred four".