21152555343255 has 32 divisors (see below), whose sum is σ = 38703454502400. Its totient is φ = 9663615545472.

The previous prime is 21152555343251. The next prime is 21152555343349. The reversal of 21152555343255 is 55234355525112.

It is not a de Polignac number, because 21152555343255 - 2² = 21152555343251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152555343251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63625500 + ... + 63957089.

It is an arithmetic number, because the mean of its divisors is an integer number (1209482953200).

Almost surely, 2^{21152555343255} is an apocalyptic number.

21152555343255 is a deficient number, since it is larger than the sum of its proper divisors (17550899159145).

21152555343255 is a wasteful number, since it uses less digits than its factorization.

21152555343255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127584183.

The product of its digits is 4500000, while the sum is 48.

The spelling of 21152555343255 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred fifty-five million, three hundred forty-three thousand, two hundred fifty-five".