21222043365650 has 48 divisors (see below), whose sum is σ = 39592677725640. Its totient is φ = 8463083596800.

The previous prime is 21222043365619. The next prime is 21222043365659. The reversal of 21222043365650 is 5656334022212.

It can be written as a sum of positive squares in 12 ways, for example, as 5218771198369 + 16003272167281 = 2284463^2 + 4000409^2 .

It is a super-2 number, since 2×21222043365650² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21222043365598 and 21222043365607.

It is not an unprimeable number, because it can be changed into a prime (21222043365659) 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 23 ways as a sum of consecutive naturals, for example, 353499836 + ... + 353559864.

Almost surely, 2^{21222043365650} is an apocalyptic number.

21222043365650 is a deficient number, since it is larger than the sum of its proper divisors (18370634359990).

21222043365650 is a wasteful number, since it uses less digits than its factorization.

21222043365650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81359 (or 81354 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 41.

Adding to 21222043365650 its reverse (5656334022212), we get a palindrome (26878377387862).

The spelling of 21222043365650 in words is "twenty-one trillion, two hundred twenty-two billion, forty-three million, three hundred sixty-five thousand, six hundred fifty".