21220244433 has 8 divisors (see below), whose sum is σ = 31437399200. Its totient is φ = 14146829604.

The previous prime is 21220244393. The next prime is 21220244503. The reversal of 21220244433 is 33444202212.

21220244433 is a `hidden beast` number, since 2 + 1 + 220 + 2 + 4 + 4 + 433 = 666.

It is not a de Polignac number, because 21220244433 - 2¹⁶ = 21220178897 is a prime.

It is a super-4 number, since 4×21220244433⁴ (a number of 42 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 785934979 = 21220244433 / (2 + 1 + 2 + 2 + 0 + 2 + 4 + 4 + 4 + 3 + 3).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220244397 and 21220244406.

It is not an unprimeable number, because it can be changed into a prime (21220244533) 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, 392967463 + ... + 392967516.

It is an arithmetic number, because the mean of its divisors is an integer number (3929674900).

Almost surely, 2^21220244433 is an apocalyptic number.

It is an amenable number.

21220244433 is a deficient number, since it is larger than the sum of its proper divisors (10217154767).

21220244433 is an equidigital number, since it uses as much as digits as its factorization.

21220244433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785934988 (or 785934982 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 21220244433 its reverse (33444202212), we get a palindrome (54664446645).

The spelling of 21220244433 in words is "twenty-one billion, two hundred twenty million, two hundred forty-four thousand, four hundred thirty-three".