21827486655 has 24 divisors (see below), whose sum is σ = 40744642848. Its totient is φ = 10745839296.

The previous prime is 21827486647. The next prime is 21827486677. The reversal of 21827486655 is 55668472812.

21827486655 is a `hidden beast` number, since 21 + 82 + 7 + 486 + 65 + 5 = 666.

It is not a de Polignac number, because 21827486655 - 2³ = 21827486647 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18655387 + ... + 18656556.

It is an arithmetic number, because the mean of its divisors is an integer number (1697693452).

Almost surely, 2^21827486655 is an apocalyptic number.

21827486655 is a deficient number, since it is larger than the sum of its proper divisors (18917156193).

21827486655 is a wasteful number, since it uses less digits than its factorization.

21827486655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37311967 (or 37311964 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 54.

The spelling of 21827486655 in words is "twenty-one billion, eight hundred twenty-seven million, four hundred eighty-six thousand, six hundred fifty-five".