21016741255 has 8 divisors (see below), whose sum is σ = 25221148272. Its totient is φ = 16812687168.

The previous prime is 21016741243. The next prime is 21016741259. The reversal of 21016741255 is 55214761012.

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

It is a cyclic number.

It is not a de Polignac number, because 21016741255 - 2⁵ = 21016741223 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21016741255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21016741259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67899 + ... + 215971.

It is an arithmetic number, because the mean of its divisors is an integer number (3152643534).

Almost surely, 2^21016741255 is an apocalyptic number.

21016741255 is a deficient number, since it is larger than the sum of its proper divisors (4204407017).

21016741255 is a wasteful number, since it uses less digits than its factorization.

21016741255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176465.

The product of its (nonzero) digits is 16800, while the sum is 34.

The spelling of 21016741255 in words is "twenty-one billion, sixteen million, seven hundred forty-one thousand, two hundred fifty-five".