21662818861224 has 32 divisors (see below), whose sum is σ = 54157681487520. Its totient is φ = 7220855042496.

The previous prime is 21662818861219. The next prime is 21662818861241. The reversal of 21662818861224 is 42216881826612.

It is a nude number because it is divisible by every one of its digits.

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, 3177234 + ... + 7308929.

It is an arithmetic number, because the mean of its divisors is an integer number (1692427546485).

Almost surely, 2^{21662818861224} is an apocalyptic number.

21662818861224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21662818861224 is an abundant number, since it is smaller than the sum of its proper divisors (32494862626296).

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

21662818861224 is a wasteful number, since it uses less digits than its factorization.

21662818861224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10572249 (or 10572245 counting only the distinct ones).

The product of its digits is 7077888, while the sum is 57.

The spelling of 21662818861224 in words is "twenty-one trillion, six hundred sixty-two billion, eight hundred eighteen million, eight hundred sixty-one thousand, two hundred twenty-four".