21355336255 has 16 divisors (see below), whose sum is σ = 28123490304. Its totient is φ = 15438146080.

The previous prime is 21355336241. The next prime is 21355336259. The reversal of 21355336255 is 55263355312.

It is not a de Polignac number, because 21355336255 - 2¹⁹ = 21354811967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21355336259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1153327 + ... + 1171696.

It is an arithmetic number, because the mean of its divisors is an integer number (1757718144).

Almost surely, 2^21355336255 is an apocalyptic number.

21355336255 is a deficient number, since it is larger than the sum of its proper divisors (6768154049).

21355336255 is a wasteful number, since it uses less digits than its factorization.

21355336255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2325206.

The product of its digits is 405000, while the sum is 40.

The spelling of 21355336255 in words is "twenty-one billion, three hundred fifty-five million, three hundred thirty-six thousand, two hundred fifty-five".