21222404442 has 24 divisors (see below), whose sum is σ = 45985754880. Its totient is φ = 7073538120.

The previous prime is 21222404429. The next prime is 21222404443. The reversal of 21222404442 is 24440422212.

21222404442 is a `hidden beast` number, since 212 + 2 + 2 + 4 + 0 + 4 + 442 = 666.

It is not an unprimeable number, because it can be changed into a prime (21222404443) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 204817 + ... + 290507.

It is an arithmetic number, because the mean of its divisors is an integer number (1916073120).

Almost surely, 2^21222404442 is an apocalyptic number.

21222404442 is an abundant number, since it is smaller than the sum of its proper divisors (24763350438).

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

21222404442 is a wasteful number, since it uses less digits than its factorization.

21222404442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99458 (or 99455 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 27.

Adding to 21222404442 its reverse (24440422212), we get a palindrome (45662826654).

The spelling of 21222404442 in words is "twenty-one billion, two hundred twenty-two million, four hundred four thousand, four hundred forty-two".