21222304141421 has 16 divisors (see below), whose sum is σ = 22158776849328. Its totient is φ = 20306082700800.

The previous prime is 21222304141417. The next prime is 21222304141439. The reversal of 21222304141421 is 12414140322212.

It can be written as a sum of positive squares in 8 ways, for example, as 20376196 + 21222283765225 = 4514^2 + 4606765^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222304141421 - 2² = 21222304141417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222304141481) 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, 3646631 + ... + 7466091.

It is an arithmetic number, because the mean of its divisors is an integer number (1384923553083).

Almost surely, 2^{21222304141421} is an apocalyptic number.

It is an amenable number.

21222304141421 is a deficient number, since it is larger than the sum of its proper divisors (936472707907).

21222304141421 is a wasteful number, since it uses less digits than its factorization.

21222304141421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3822112.

The product of its (nonzero) digits is 6144, while the sum is 29.

Adding to 21222304141421 its reverse (12414140322212), we get a palindrome (33636444463633).

The spelling of 21222304141421 in words is "twenty-one trillion, two hundred twenty-two billion, three hundred four million, one hundred forty-one thousand, four hundred twenty-one".