21222236664064 has 72 divisors (see below), whose sum is σ = 44854816872600. Its totient is φ = 9986626387968.

The previous prime is 21222236664029. The next prime is 21222236664071. The reversal of 21222236664064 is 46046663222212.

It can be written as a sum of positive squares in 4 ways, for example, as 11218426769664 + 10003809894400 = 3349392^2 + 3162880^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 204896962 + ... + 205000510.

It is an arithmetic number, because the mean of its divisors is an integer number (622983567675).

Almost surely, 2^{21222236664064} is an apocalyptic number.

It is an amenable number.

21222236664064 is an abundant number, since it is smaller than the sum of its proper divisors (23632580208536).

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

21222236664064 is a wasteful number, since it uses less digits than its factorization.

21222236664064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150675 (or 150661 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 46.

Adding to 21222236664064 its reverse (46046663222212), we get a palindrome (67268899886276).

The spelling of 21222236664064 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred thirty-six million, six hundred sixty-four thousand, sixty-four".