21445012221442 has 8 divisors (see below), whose sum is σ = 32167805486796. Its totient is φ = 10722410392512.

The previous prime is 21445012221433. The next prime is 21445012221467. The reversal of 21445012221442 is 24412221054412.

It can be written as a sum of positive squares in 2 ways, for example, as 21107858960241 + 337153261201 = 4594329^2 + 580649^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21445012221398 and 21445012221407.

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 3 ways as a sum of consecutive naturals, for example, 47578723 + ... + 48027334.

Almost surely, 2^{21445012221442} is an apocalyptic number.

21445012221442 is a deficient number, since it is larger than the sum of its proper divisors (10722793265354).

21445012221442 is a wasteful number, since it uses less digits than its factorization.

21445012221442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95718212.

The product of its (nonzero) digits is 40960, while the sum is 34.

Adding to 21445012221442 its reverse (24412221054412), we get a palindrome (45857233275854).

The spelling of 21445012221442 in words is "twenty-one trillion, four hundred forty-five billion, twelve million, two hundred twenty-one thousand, four hundred forty-two".