21222130342144 has 18 divisors (see below), whose sum is σ = 42361361738150. Its totient is φ = 10611065170944.

The previous prime is 21222130342123. The next prime is 21222130342151. The reversal of 21222130342144 is 44124303122212.

It can be written as a sum of positive squares in only one way, i.e., 18766917126400 + 2455213215744 = 4332080^2 + 1566912^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41449473069 + ... + 41449473580.

Almost surely, 2^{21222130342144} is an apocalyptic number.

It is an amenable number.

21222130342144 is a deficient number, since it is larger than the sum of its proper divisors (21139231396006).

21222130342144 is an frugal number, since it uses more digits than its factorization.

21222130342144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82898946665 (or 82898946651 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 21222130342144 its reverse (44124303122212), we get a palindrome (65346433464356).

The spelling of 21222130342144 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred thirty million, three hundred forty-two thousand, one hundred forty-four".