21222016424066 has 16 divisors (see below), whose sum is σ = 33753637639800. Its totient is φ = 9972584697600.

The previous prime is 21222016423991. The next prime is 21222016424087. The reversal of 21222016424066 is 66042461022212.

It can be written as a sum of positive squares in 4 ways, for example, as 20800705086841 + 421311337225 = 4560779^2 + 649085^2 .

It is a super-2 number, since 2×21222016424066² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 445180841 + ... + 445228508.

Almost surely, 2^{21222016424066} is an apocalyptic number.

21222016424066 is a deficient number, since it is larger than the sum of its proper divisors (12531621215734).

21222016424066 is a wasteful number, since it uses less digits than its factorization.

21222016424066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890410069.

The product of its (nonzero) digits is 110592, while the sum is 38.

Adding to 21222016424066 its reverse (66042461022212), we get a palindrome (87264477446278).

The spelling of 21222016424066 in words is "twenty-one trillion, two hundred twenty-two billion, sixteen million, four hundred twenty-four thousand, sixty-six".