21010523255 has 8 divisors (see below), whose sum is σ = 25495916400. Its totient is φ = 16619559616.

The previous prime is 21010523173. The next prime is 21010523263. The reversal of 21010523255 is 55232501012.

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 21010523255 - 2²⁶ = 20943414391 is a prime.

It is a super-3 number, since 3×21010523255³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23606885 + ... + 23607774.

It is an arithmetic number, because the mean of its divisors is an integer number (3186989550).

Almost surely, 2^21010523255 is an apocalyptic number.

21010523255 is a deficient number, since it is larger than the sum of its proper divisors (4485393145).

21010523255 is an equidigital number, since it uses as much as digits as its factorization.

21010523255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47214753.

The product of its (nonzero) digits is 3000, while the sum is 26.

The spelling of 21010523255 in words is "twenty-one billion, ten million, five hundred twenty-three thousand, two hundred fifty-five".