21010663255 has 8 divisors (see below), whose sum is σ = 25242152400. Its totient is φ = 16788959616.

The previous prime is 21010663237. The next prime is 21010663313. The reversal of 21010663255 is 55236601012.

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 21010663255 - 2⁷ = 21010663127 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2441650 + ... + 2450239.

It is an arithmetic number, because the mean of its divisors is an integer number (3155269050).

Almost surely, 2^21010663255 is an apocalyptic number.

21010663255 is a deficient number, since it is larger than the sum of its proper divisors (4231489145).

21010663255 is an equidigital number, since it uses as much as digits as its factorization.

21010663255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4892753.

The product of its (nonzero) digits is 10800, while the sum is 31.

The spelling of 21010663255 in words is "twenty-one billion, ten million, six hundred sixty-three thousand, two hundred fifty-five".