21442040405255 has 8 divisors (see below), whose sum is σ = 25985205402624. Its totient is φ = 16983794380000.

The previous prime is 21442040405237. The next prime is 21442040405371. The reversal of 21442040405255 is 55250404024412.

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

It is not a de Polignac number, because 21442040405255 - 2¹⁶ = 21442040339719 is a prime.

It is a super-2 number, since 2×21442040405255² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21229742471 + ... + 21229743480.

It is an arithmetic number, because the mean of its divisors is an integer number (3248150675328).

Almost surely, 2^{21442040405255} is an apocalyptic number.

21442040405255 is a deficient number, since it is larger than the sum of its proper divisors (4543164997369).

21442040405255 is a wasteful number, since it uses less digits than its factorization.

21442040405255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42459486057.

The product of its (nonzero) digits is 256000, while the sum is 38.

Adding to 21442040405255 its reverse (55250404024412), we get a palindrome (76692444429667).

The spelling of 21442040405255 in words is "twenty-one trillion, four hundred forty-two billion, forty million, four hundred five thousand, two hundred fifty-five".