21285548955 has 80 divisors (see below), whose sum is σ = 44073764064. Its totient is φ = 9713157120.

The previous prime is 21285548929. The next prime is 21285549001. The reversal of 21285548955 is 55984558212.

21285548955 is a `hidden beast` number, since 2 + 1 + 2 + 8 + 5 + 548 + 95 + 5 = 666.

It is not a de Polignac number, because 21285548955 - 2⁵ = 21285548923 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 64792 + ... + 216261.

Almost surely, 2^21285548955 is an apocalyptic number.

21285548955 is an abundant number, since it is smaller than the sum of its proper divisors (22788215109).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21285548955 is a wasteful number, since it uses less digits than its factorization.

21285548955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281098 (or 281089 counting only the distinct ones).

The product of its digits is 5760000, while the sum is 54.

The spelling of 21285548955 in words is "twenty-one billion, two hundred eighty-five million, five hundred forty-eight thousand, nine hundred fifty-five".