21005054105342 has 8 divisors (see below), whose sum is σ = 31507740623016. Its totient is φ = 10502473897672.

The previous prime is 21005054105281. The next prime is 21005054105359. The reversal of 21005054105342 is 24350145050012.

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 = 21005054105299 and 21005054105308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26081693 + ... + 26874984.

It is an arithmetic number, because the mean of its divisors is an integer number (3938467577877).

Almost surely, 2^{21005054105342} is an apocalyptic number.

21005054105342 is a deficient number, since it is larger than the sum of its proper divisors (10502686517674).

21005054105342 is a wasteful number, since it uses less digits than its factorization.

21005054105342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53155002.

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 21005054105342 its reverse (24350145050012), we get a palindrome (45355199155354).

The spelling of 21005054105342 in words is "twenty-one trillion, five billion, fifty-four million, one hundred five thousand, three hundred forty-two".