21042245011355 has 64 divisors (see below), whose sum is σ = 29461248460800. Its totient is φ = 14310932613120.

The previous prime is 21042245011301. The next prime is 21042245011379. The reversal of 21042245011355 is 55311054224012.

It is not a de Polignac number, because 21042245011355 - 2²² = 21042240817051 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10641341 + ... + 12462849.

It is an arithmetic number, because the mean of its divisors is an integer number (460332007200).

Almost surely, 2^{21042245011355} is an apocalyptic number.

21042245011355 is a deficient number, since it is larger than the sum of its proper divisors (8419003449445).

21042245011355 is a wasteful number, since it uses less digits than its factorization.

21042245011355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1821884.

The product of its (nonzero) digits is 48000, while the sum is 35.

Adding to 21042245011355 its reverse (55311054224012), we get a palindrome (76353299235367).

The spelling of 21042245011355 in words is "twenty-one trillion, forty-two billion, two hundred forty-five million, eleven thousand, three hundred fifty-five".