21201222211170 has 16 divisors (see below), whose sum is σ = 50882933306880. Its totient is φ = 5653659256304.

The previous prime is 21201222211121. The next prime is 21201222211171. The reversal of 21201222211170 is 7111222210212.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21201222211170.

It is not an unprimeable number, because it can be changed into a prime (21201222211171) 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 7 ways as a sum of consecutive naturals, for example, 353353703490 + ... + 353353703549.

It is an arithmetic number, because the mean of its divisors is an integer number (3180183331680).

Almost surely, 2^{21201222211170} is an apocalyptic number.

21201222211170 is an abundant number, since it is smaller than the sum of its proper divisors (29681711095710).

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

21201222211170 is a wasteful number, since it uses less digits than its factorization.

21201222211170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706707407049.

The product of its (nonzero) digits is 448, while the sum is 24.

Adding to 21201222211170 its reverse (7111222210212), we get a palindrome (28312444421382).

The spelling of 21201222211170 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-two million, two hundred eleven thousand, one hundred seventy".