21235655255 has 8 divisors (see below), whose sum is σ = 25516722624. Its totient is φ = 16965900000.

The previous prime is 21235655219. The next prime is 21235655261. The reversal of 21235655255 is 55255653212.

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

It is not a de Polignac number, because 21235655255 - 2¹² = 21235651159 is a prime.

It is a Duffinian number.

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, 2823896 + ... + 2831405.

It is an arithmetic number, because the mean of its divisors is an integer number (3189590328).

Almost surely, 2^21235655255 is an apocalyptic number.

21235655255 is a deficient number, since it is larger than the sum of its proper divisors (4281067369).

21235655255 is an equidigital number, since it uses as much as digits as its factorization.

21235655255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5656057.

The product of its digits is 450000, while the sum is 41.

The spelling of 21235655255 in words is "twenty-one billion, two hundred thirty-five million, six hundred fifty-five thousand, two hundred fifty-five".