21747105960 has 64 divisors (see below), whose sum is σ = 65251051200. Its totient is φ = 5798363136.

The previous prime is 21747105917. The next prime is 21747105971. The reversal of 21747105960 is 6950174712.

It is a happy number.

It is a Cunningham number, because it is equal to 147469²-1.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1467307 + ... + 1482053.

It is an arithmetic number, because the mean of its divisors is an integer number (1019547675).

Almost surely, 2^21747105960 is an apocalyptic number.

21747105960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21747105960 is an abundant number, since it is smaller than the sum of its proper divisors (43503945240).

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

21747105960 is a wasteful number, since it uses less digits than its factorization.

21747105960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27050 (or 27046 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 42.

The spelling of 21747105960 in words is "twenty-one billion, seven hundred forty-seven million, one hundred five thousand, nine hundred sixty".