21655481116 has 24 divisors (see below), whose sum is σ = 40004732880. Its totient is φ = 10228787712.

The previous prime is 21655481069. The next prime is 21655481123. The reversal of 21655481116 is 61118455612.

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, 376771 + ... + 430426.

It is an arithmetic number, because the mean of its divisors is an integer number (1666863870).

Almost surely, 2^21655481116 is an apocalyptic number.

It is an amenable number.

21655481116 is a deficient number, since it is larger than the sum of its proper divisors (18349251764).

21655481116 is a wasteful number, since it uses less digits than its factorization.

21655481116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807573 (or 807571 counting only the distinct ones).

The product of its digits is 57600, while the sum is 40.

The spelling of 21655481116 in words is "twenty-one billion, six hundred fifty-five million, four hundred eighty-one thousand, one hundred sixteen".