21773308823720 has 32 divisors (see below), whose sum is σ = 49027542779520. Its totient is φ = 8702639453760.

The previous prime is 21773308823687. The next prime is 21773308823723. The reversal of 21773308823720 is 2732880337712.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21773308823723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208824596 + ... + 208928835.

It is an arithmetic number, because the mean of its divisors is an integer number (1532110711860).

Almost surely, 2^{21773308823720} is an apocalyptic number.

21773308823720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21773308823720 is an abundant number, since it is smaller than the sum of its proper divisors (27254233955800).

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

21773308823720 is a wasteful number, since it uses less digits than its factorization.

21773308823720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417754745 (or 417754741 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 53.

The spelling of 21773308823720 in words is "twenty-one trillion, seven hundred seventy-three billion, three hundred eight million, eight hundred twenty-three thousand, seven hundred twenty".