21321212302224 has 80 divisors (see below), whose sum is σ = 61345144215040. Its totient is φ = 7090189303680.

The previous prime is 21321212302223. The next prime is 21321212302297. The reversal of 21321212302224 is 42220321212312.

21321212302224 is a `hidden beast` number, since 2 + 1 + 321 + 2 + 12 + 302 + 2 + 24 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21321212302223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58434112 + ... + 58797855.

It is an arithmetic number, because the mean of its divisors is an integer number (766814302688).

Almost surely, 2^{21321212302224} is an apocalyptic number.

21321212302224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21321212302224 is an abundant number, since it is smaller than the sum of its proper divisors (40023931912816).

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

21321212302224 is a wasteful number, since it uses less digits than its factorization.

21321212302224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117232405 (or 117232393 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 21321212302224 its reverse (42220321212312), we get a palindrome (63541533514536).

The spelling of 21321212302224 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred twelve million, three hundred two thousand, two hundred twenty-four".