21342551455442 has 16 divisors (see below), whose sum is σ = 36587295464832. Its totient is φ = 9146791667040.

The previous prime is 21342551455387. The next prime is 21342551455451. The reversal of 21342551455442 is 24455415524312.

It is a super-2 number, since 2×21342551455442² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10501142 + ... + 12367662.

It is an arithmetic number, because the mean of its divisors is an integer number (2286705966552).

Almost surely, 2^{21342551455442} is an apocalyptic number.

21342551455442 is a deficient number, since it is larger than the sum of its proper divisors (15244744009390).

21342551455442 is a wasteful number, since it uses less digits than its factorization.

21342551455442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2683273.

The product of its digits is 3840000, while the sum is 47.

Adding to 21342551455442 its reverse (24455415524312), we get a palindrome (45797966979754).

The spelling of 21342551455442 in words is "twenty-one trillion, three hundred forty-two billion, five hundred fifty-one million, four hundred fifty-five thousand, four hundred forty-two".