21224034435442 has 16 divisors (see below), whose sum is σ = 32468879441880. Its totient is φ = 10401471505152.

The previous prime is 21224034435431. The next prime is 21224034435463. The reversal of 21224034435442 is 24453443042212.

It can be written as a sum of positive squares in 4 ways, for example, as 20704238136481 + 519796298961 = 4550191^2 + 720969^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21224034435395 and 21224034435404.

It is an unprimeable number.

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, 99113433 + ... + 99327340.

Almost surely, 2^{21224034435442} is an apocalyptic number.

21224034435442 is a deficient number, since it is larger than the sum of its proper divisors (11244845006438).

21224034435442 is a wasteful number, since it uses less digits than its factorization.

21224034435442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198441837.

The product of its (nonzero) digits is 737280, while the sum is 40.

Adding to 21224034435442 its reverse (24453443042212), we get a palindrome (45677477477654).

The spelling of 21224034435442 in words is "twenty-one trillion, two hundred twenty-four billion, thirty-four million, four hundred thirty-five thousand, four hundred forty-two".