21221352633224 has 64 divisors (see below), whose sum is σ = 42880740336000. Its totient is φ = 9825512327680.

The previous prime is 21221352633223. The next prime is 21221352633241. The reversal of 21221352633224 is 42233625312212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21221352633223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18345644 + ... + 19468059.

It is an arithmetic number, because the mean of its divisors is an integer number (670011567750).

Almost surely, 2^{21221352633224} is an apocalyptic number.

It is an amenable number.

21221352633224 is an abundant number, since it is smaller than the sum of its proper divisors (21659387702776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221352633224 is a wasteful number, since it uses less digits than its factorization.

21221352633224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37813838 (or 37813834 counting only the distinct ones).

The product of its digits is 207360, while the sum is 38.

Adding to 21221352633224 its reverse (42233625312212), we get a palindrome (63454977945436).

The spelling of 21221352633224 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred fifty-two million, six hundred thirty-three thousand, two hundred twenty-four".