21081185688352 has 12 divisors (see below), whose sum is σ = 41503584324006. Its totient is φ = 10540592844160.

The previous prime is 21081185688287. The next prime is 21081185688379. The reversal of 21081185688352 is 25388658118012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20251476026896 + 829709661456 = 4500164^2 + 910884^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329393526349 + ... + 329393526412.

Almost surely, 2^{21081185688352} is an apocalyptic number.

It is an amenable number.

21081185688352 is a deficient number, since it is larger than the sum of its proper divisors (20422398635654).

21081185688352 is an equidigital number, since it uses as much as digits as its factorization.

21081185688352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658787052771 (or 658787052763 counting only the distinct ones).

The product of its (nonzero) digits is 7372800, while the sum is 58.

The spelling of 21081185688352 in words is "twenty-one trillion, eighty-one billion, one hundred eighty-five million, six hundred eighty-eight thousand, three hundred fifty-two".