21222030642664 has 16 divisors (see below), whose sum is σ = 39808844424900. Its totient is φ = 10606338796032.

The previous prime is 21222030642643. The next prime is 21222030642727. The reversal of 21222030642664 is 46624603022212.

It can be written as a sum of positive squares in 2 ways, for example, as 21141512040100 + 80518602564 = 4597990^2 + 283758^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 584546377 + ... + 584582680.

Almost surely, 2^{21222030642664} is an apocalyptic number.

It is an amenable number.

21222030642664 is a deficient number, since it is larger than the sum of its proper divisors (18586813782236).

21222030642664 is a wasteful number, since it uses less digits than its factorization.

21222030642664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1169131332 (or 1169131328 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 40.

Adding to 21222030642664 its reverse (46624603022212), we get a palindrome (67846633664876).

The spelling of 21222030642664 in words is "twenty-one trillion, two hundred twenty-two billion, thirty million, six hundred forty-two thousand, six hundred sixty-four".