21233244304442 has 16 divisors (see below), whose sum is σ = 33527058170400. Its totient is φ = 10057587679440.

The previous prime is 21233244304387. The next prime is 21233244304451. The reversal of 21233244304442 is 24440344233212.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 21233244304396 and 21233244304405.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5892284 + ... + 8785527.

It is an arithmetic number, because the mean of its divisors is an integer number (2095441135650).

Almost surely, 2^{21233244304442} is an apocalyptic number.

21233244304442 is a deficient number, since it is larger than the sum of its proper divisors (12293813865958).

21233244304442 is a wasteful number, since it uses less digits than its factorization.

21233244304442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14715901.

The product of its (nonzero) digits is 442368, while the sum is 38.

Adding to 21233244304442 its reverse (24440344233212), we get a palindrome (45673588537654).

The spelling of 21233244304442 in words is "twenty-one trillion, two hundred thirty-three billion, two hundred forty-four million, three hundred four thousand, four hundred forty-two".